2026 Midterm Tracker: Key Retirements and Open Seats

Record congressional retirements, a historically favorable Democratic environment, and mid-decade redistricting are reshaping the 2026 midterm map. Here is every retirement, open seat, and competitive race you need to track.

A Historic Exodus From Congress Reshapes the Battlefield

Congress is hemorrhaging members. The 2026 cycle has produced 68 total retirements — 11 senators and 57 House members — the second-highest departure count since 1992. Republicans are leaving at a sharply disproportionate rate: 36 House Republicans versus 22 Democrats, breaking the single-party record of 34 Republican retirements set in 2018, the cycle that preceded Democrats’ 40-seat House wave.

The imbalance tells you something about how Republicans feel about this environment. NPR reported in December 2025 that the retirement pace was record-setting and accelerating, driven overwhelmingly by GOP members.

On the Senate side, four Democrats and seven Republicans have announced they will not seek re-election, creating open seats that dramatically alter the competitive map. Several departures carry immense institutional weight: Dick Durbin (D-IL), the 82-year-old Democratic Whip with 44 years in Congress; Mitch McConnell (R-KY), who served a record-setting tenure as party leader across 42 years in the Senate; and Jeanne Shaheen (D-NH), a former governor and three-term senator stepping aside at age 79.

Among House retirees, the departures of Nancy Pelosi (D-CA), the first female Speaker who shaped Democratic politics for four decades, and Steny Hoyer (D-MD), the longest-serving House Democrat and former Majority Leader, mark the end of an era. Three Republican committee chairs are also departing: Sam Graves (Transportation & Infrastructure), Jodey Arrington (Budget), and Michael McCaul (Foreign Affairs).

Senate Retirements and Open-Seat Dynamics

Democrats Not Seeking Re-Election (4)

Republicans Not Seeking Re-Election (7)

The Daines retirement stands as perhaps the most dramatic of the cycle. The Montana senator withdrew his candidacy just two minutes before the March 4 filing deadline, moments after U.S. Attorney Kurt Alme — who received Trump’s immediate endorsement — filed his own paperwork. The maneuver drew bipartisan criticism. Independent Seth Bodnar, a former University of Montana president and Green Beret, entered the race the same day. Fox News reported that Daines framed the exit as a retirement, though he had been raising money and campaigning for months.

The Senate Map: 35 Races and a Narrow Democratic Path

The 35-seat Senate map includes 20 Republican-held seats, 13 Democratic-held seats, and 2 Republican-held special elections in Florida and Ohio, both vacated when Marco Rubio became Secretary of State and JD Vance became Vice President. Democrats need a net gain of four to reach 51 seats and the majority — a 50-50 split keeps Republicans in control via VP Vance’s tiebreaking vote.

If you track legislator intelligence through Quorum Federal, this is the cycle where those profiles matter most. Eleven senators departing means eleven new members you will need to build relationships with from scratch.

Toss-Up Senate Races (4)

Lean Republican Races (2)

Race ratings draw from the Cook Political Report, Sabato’s Crystal Ball, and Inside Elections, all updated through March 2026. Safe seats on both sides (14+ Republican, 9 Democratic) are omitted for brevity.

Despite the favorable environment, Republicans remain slight favorites to hold the Senate because even sweeping all four Toss-up races would give Democrats only about 49 seats. Democrats must also win at least one Lean Republican race — likely Alaska, Ohio, or Iowa — to reach a governing majority. Polymarket gives Democrats a slim 51.5% edge for Senate control, reflecting genuine uncertainty.

House Races: Democrats Favored to Flip a Razor-Thin Majority

Republicans currently hold a 220–215 majority (with vacancies), meaning Democrats need a net gain of just 3 seats to win the 218 required for control. Most forecasters favor Democrats. RacetotheWH gives Democrats roughly a 69% chance of winning the House. Ipsos ran five independent projection models and all five project Republicans finishing below 218 seats. Sabato’s Crystal Ball put it plainly: Democrats should flip the House, and they are favored to do so.

The Toss-Up Battleground

The Cook Political Report identified 18 toss-up House races in its January 2026 initial ratings — 10 Democratic-held and 8 Republican-held.

Democratic-held toss-ups: CA-13 (Adam Gray), CA-45 (Derek Tran), ME-02 (Jared Golden/open), NM-02 (Gabe Vasquez), NY-04 (Laura Gillen), NC-01 (Don Davis), OH-09 (Marcy Kaptur), OH-13 (Emilia Sykes), TX-34 (Vicente Gonzalez), WA-03 (Marie Gluesenkamp Perez).

Republican-held toss-ups: AZ-01 (open, Schweikert running for governor), AZ-06 (Juan Ciscomani), CO-08 (Gabe Evans), IA-01 (Mariannette Miller-Meeks), MI-07 (Tom Barrett), NE-02 (open, Bacon retiring), PA-07 (Ryan Mackenzie), PA-10 (Scott Perry).

By March, ratings had shifted further toward Democrats. Roll Call reported that nine House races moved toward Democrats in a single ratings update. Inside Elections now shows Republicans defending 33 competitive seats versus Democrats’ 29 — a reversal from the typical incumbent-party advantage.

Open Seats Most Likely to Flip

The retirements creating the highest-stakes open seats span both parties. NE-02 (Don Bacon, R) is the top Democratic pickup opportunity. Bacon, a moderate who repeatedly won an Omaha district that Harris carried in 2024, is retiring. Without his personal brand, this seat is extremely difficult for Republicans to hold.

CA-48 (Darrell Issa, R) is another major target. Issa announced his second career retirement in March 2026, and California’s new redistricting map — approved by voters via Proposition 50 in November 2025 — redrew his district to favor Democrats. Cook now rates it Lean Democrat.

ME-02 (Jared Golden, D) is the top Republican pickup opportunity. Golden, a moderate Democrat, repeatedly won a rural district Trump carried by roughly 10 points. His retirement likely hands this seat to the GOP.

If you track competitive districts through Quorum State or use Quorum Grassroots for advocacy campaigns, these open seats represent prime territory for early engagement before new members take office in January 2027.

Redistricting: A Mid-Decade Arms Race

An unprecedented wave of mid-decade redistricting has reshaped the House map in at least six states, driven by both parties seeking partisan advantage.

Texas signed new Republican-drawn maps in August 2025 after Trump called on the state to redraw lines to protect the House majority. The maps create roughly 5 new GOP-leaning districts. A federal court ruled the maps an illegal racial gerrymander in November 2025, but the Supreme Court allowed them to proceed for 2026. Democratic Reps. Lloyd Doggett and Marc Veasey retired as a direct result.

California responded in kind. Governor Newsom declared that “two can play that game,” and the legislature passed a Democratic-favorable map that voters approved as Proposition 50 in November 2025 with 65% support. Federal judges rejected a Republican challenge, and the Supreme Court denied the appeal. The new maps could net Democrats up to 5 additional seats, roughly canceling Texas’s gains.

North Carolina passed a new map in October 2025 that significantly redraws NC-01 (held by Democrat Don Davis) to be more Republican. Missouri used a special legislative session to convert the Democratic-held MO-05 (Kansas City area) into a solid Republican district. Ohio adopted a bipartisan map under a constitutional amendment. Utah received a court-ordered map that creates a new safe Democratic district in Salt Lake County.

The net redistricting impact is roughly a wash nationally — Republican gains in Texas, North Carolina, and Missouri are largely offset by Democratic gains in California and Utah — though the final balance depends on ongoing litigation in several states.

The Political Environment Strongly Favors Democrats

Historical patterns provide the strongest signal: in 20 of 22 midterms since 1938, the president’s party has lost House seats, with average losses of approximately 28 House seats and 4 Senate seats. The only exceptions were 2002 (post-9/11) and 1998 (Clinton impeachment backlash). Brookings noted that Trump’s sustained negative approval correlates closely with the scale of midterm losses.

The 2025 off-year elections provided powerful leading indicators. Democrat Abigail Spanberger won the Virginia governorship by 15 points, and Democrat Mikie Sherrill won New Jersey by 14 points — significant given that New Jersey lurched toward Trump in 2024. Democratic pollster Molly Murphy found that Democrats outperformed Republicans’ 2024 vote in 50 of 60 special elections held during 2025, with an average swing of 13 points toward Democrats.

Key issues driving the environment include economic anxiety stemming from Trump’s tariff regime (CNBC reported the effective tariff rate rose from 2.1% to roughly 11.7%), healthcare fears as ACA subsidy cuts and Medicaid reductions take effect, and an Iran military conflict that about 55% of Americans oppose.

An NPR/PBS/Marist poll from November 2025 showed Democrats leading the generic ballot by 14 points (55%–41%), the largest Democratic advantage in that poll since November 2017.

What to Watch Through November

The 2026 midterms are poised to deliver meaningful Democratic gains, though the magnitude remains uncertain. The House appears likely to flip — forecasters give Democrats roughly a 60–69% probability of winning the majority, needing only 3 net seats amid a historically favorable environment. The Senate is genuinely uncertain: Democrats have plausible paths to a 4-seat net gain through Maine, North Carolina, Michigan, and one of Alaska, Ohio, or Iowa, but they must win in Trump-won territory to get there.

Three variables could still reshape the map before November. The Supreme Court’s pending ruling on IEEPA tariff authority could either validate or dismantle Trump’s trade policy, dramatically shifting the economic debate. The Iran conflict remains volatile — an escalation or de-escalation could reorder voter priorities overnight. And redistricting litigation in Florida, Virginia, and other states could add or subtract competitive seats from either party’s column.

The primary calendar stretches from March through September, with Texas, North Carolina, and Illinois already complete and major states like California, Michigan, and Pennsylvania still ahead. With record retirements, an energized Democratic base, and a president mired in sustained disapproval, the 2026 midterms carry the potential for a wave election that fundamentally realigns congressional power. Or, in a polarized era where wave elections have proven elusive, a narrower correction that still hands Democrats the House gavel while leaves Senate control on a knife’s edge.

Either way, every one of these races changes who you will be talking to in January 2027. Start preparing now.

Frequently Asked Questions

References

1. The Hill — “House Republicans flee Congress in record numbers amid growing dysfunction”
2. NPR — “The record-setting pace of retirements from Congress continues, led by Republicans”
3. NPR — “Here are the members of Congress not running for reelection in 2026”
4. The Hill — “Which congressional lawmakers aren’t seeking reelection in 2026?”
5. Montana Free Press — “As filings close, Republican Steve Daines withdraws from U.S. Senate race”
6. Fox News — “Top Trump ally Steve Daines exits Montana Senate race, plans to retire”
7. 270toWin — “2026 Senate Election Interactive Map”
8. 270toWin — “Cook Political Report 2026 Senate Race Ratings”
9. 270toWin — “Sabato’s Crystal Ball 2026 Senate Race Ratings”
10. Polymarket — “Which party will win the Senate in 2026?”
11. Race to the WH — “Predictions for the House — 2026 Midterms”
12. Ipsos — “What midterm projections tell us about Trump’s central struggle”
13. Sabato’s Crystal Ball — “The House: Democrats Favored on What Starts as a Small Battlefield”
14. The Hill — “Cook Political Report unveils 18 toss-up House races for 2026”
15. Roll Call — “Ratings changes: 9 House races move toward Democrats”
16. National Today — “GOP Rep. Darrell Issa Announces Second Retirement”
17. Ballotpedia — “Redistricting ahead of the 2026 elections”
18. PBS News — “What’s next in the national redistricting fight after California approved a new U.S. House map”
19. MultiState — “State Redistricting Legal Challenges Intensify Ahead of 2026 Elections”
20. Brookings — “What history tells us about the 2026 midterm elections”
21. Las Vegas Sun — “Momentum swinging Democrats’ way after election wins, stagnant Trump approval”
22. CNBC — “Tariff bills across U.S. states mount as affordability and Trump head for midterm elections showdown”
23. NPR — “Democrats have edge going into 2026 midterms, new poll shows”