The 2026 midterm elections have seen the highest number of House incumbents fail to win renomination in the 21st century. So far, 10 House members have been defeated by primary challengers in the 2026 election cycle, with both Democrats and Republicans represented on the list.

While there is no single pattern behind the Republican defeats, most Democratic incumbents were ousted either by candidates from the party’s left flank or by younger challengers.

Here are the 10 House members who have lost their primaries in the 2026 midterm election cycle:

1. Rep. Diana DeGette — Colorado-1

Rep. Diana DeGette lost her Democratic primary to Democratic Socialist Melat Kiros after nearly three decades in the House. DeGette was first elected to her Denver-area seat in 1996.

Her long tenure became a liability as an anti-incumbent wave helped propel 29-year-old Kiros to a double-digit victory.

DeGette’s acceptance of corporate and PAC donations, along with her support for Israel, became key issues that Kiros used to differentiate herself from the incumbent.

2. Rep. Dan Goldman — New York-10

Support for Israel was a major factor in two-term incumbent Dan Goldman’s defeat by Brad Lander in the Democratic primary for New York’s 10th Congressional District.

Lander, backed by the Democratic Socialist Alliance (DSA) and New York City Mayor Zohran Mamdani, defeated Goldman as progressive frustration grew over his establishment ties. Lander also benefited from his alignment with the city’s left-wing political movement.

3. Rep. Thomas Massie — Kentucky-4

Rep. Thomas Massie, one of President Donald Trump’s most prominent Republican critics in Congress, was defeated by Ed Gallrein, who had Trump’s backing and significant financial support.

Massie had clashed with Trump on several issues, most notably the release of the Epstein Files. His disputes with the president eventually contributed to his defeat in Kentucky’s deeply conservative 4th Congressional District.

4. Rep. Adriano Espaillat — New York-13

A generational divide in the Democratic Party was at the forefront of Rep. Adriano Espaillat’s primary defeat.

DSA- and Mamdani-backed progressive Darializa Chevalier unseated the 10-year incumbent in New York’s 13th Congressional District. Chevalier also criticized Espaillat over his foreign policy positions and ties to the establishment.

5. Rep. John Larson — Connecticut-1

Like Espaillat, Rep. John Larson was defeated by a much younger opponent.

Former Hartford Mayor Luke Bronin defeated Larson by more than 20 points after portraying the longtime congressman as out of touch with his constituents and their needs following 28 years in Congress.

6. Rep. Dan Crenshaw — Texas-2

Rep. Dan Crenshaw, the only Republican incumbent not endorsed by Trump, lost renomination to state Rep. Steve Toth in the Republican primary for Texas’ 2nd Congressional District.

Trump’s non-endorsement, ideological clashes with the MAGA movement, high-profile intraparty feuds and a redrawn district all contributed to Crenshaw’s defeat.

7. Rep. Andy Ogles — Tennessee-5

Staunch conservative Rep. Andy Ogles was defeated by former Tennessee state official Charlie Hatcher despite Trump’s endorsement.

Ogles became the only Trump-backed House member to lose a Republican primary in 2026. His defeat was driven by an extensive redraw of his original congressional district during Tennessee’s mid-decade redistricting, significant outside Super PAC spending and a series of personal campaign controversies.

8. Rep. Al Green — Texas-18

Longtime Texas Democrat Rep. Al Green’s congressional career came to an end after he lost an incumbent-on-incumbent primary to Rep. Christian Menefee.

The two faced each other after Texas’ mid-decade redrawing of congressional districts. Voters in the newly drawn 18th District preferred the much younger Menefee over Green, who had served for 22 years.

9. Rep. Julie Johnson — Texas-33

Rep. Julie Johnson lost the Democratic primary runoff in Texas’ 33rd Congressional District to former Rep. Colin Allred on May 26, 2026.

Her defeat was primarily attributed to extensive congressional redistricting, Allred’s stronger name recognition and successful campaign attacks over personal stock trades.

10. Rep. Shri Thanedar — Michigan-13

Rep. Shri Thanedar, who has served in the House since 2023, lost the Democratic primary in Michigan’s 13th Congressional District to state Rep. Donavan McKinney, a Democratic socialist.