Incumbents Face Tough Primary Season in 2026 Elections

The current primary season is proving challenging for incumbents in Congress. Diana DeGette from Colorado recently became the latest to lose her bid for renomination in the 2026 midterm elections, as reported by Decision Desk HQ on Tuesday night. This reflects broader changes in both Democratic and Republican parties.

Democratic and Republican Changes

Many Democratic voters express dissatisfaction with party leadership, citing what they perceive as a lukewarm response to President Trump’s second term. This sentiment has driven support for progressive challengers. Additionally, some primaries are influenced by generational issues.

On the Republican side, several incumbents criticized by Trump have lost, with the former president endorsing their challengers. Upcoming primaries in over a dozen states might further increase these incumbent losses.

Comparing to Recent Election Cycles

House of Representative Incumbent Losses

This year, seven House incumbents have lost their primaries. This is up from four in 2024. In 2020, there were eight losses, setting a modern record for a non-redistricting cycle. In prior cycles, losses ranged from one to five incumbents. Redistricting years like 2012 and 2022 saw even more losses due to changes in district boundaries, affecting 15 and 12 incumbents respectively.

Senate Incumbent Losses

Senate primary losses are less common. However, two Republican senators have already lost this cycle. The last Senate primary loss occurred in 2017 with Luther Strange. Before that, in 2012, GOP Senator Richard Lugar lost his primary. In 2010, Alaska Senator Lisa Murkowski lost her primary but won the general election with a write-in campaign.

Reasons for Incumbent Losses in 2026

Stephen Farnsworth, a political science professor, explains these losses: “Voters often desire change, resulting in tough midterms for incumbents.” Trump has aggressively targeted Republican incumbents he finds disloyal. Meanwhile, Democratic races show a demand for nominees who are more resistant to Trump.

Notable Incumbent Losses in 2026

• Bill Cassidy (Louisiana Republican): Lost to Trump-backed Julia Letlow. Criticized for his vote against Trump during impeachment.
• John Cornyn (Texas Republican): Lost to Ken Paxton. Criticized for his bipartisan gun bill support.
• Dan Crenshaw (Texas Republican): Endorsed against by Trump. Criticized for aiding Ukraine and certifying Biden’s victory.
• Diana DeGette (Colorado Democrat): Lost to Melat Kiros, perceived as more progressive.
• Adriano Espaillat (New York Democrat): Lost to Darializa Avila Chevalier. Focus was on progressive issues.
• Dan Goldman (New York Democrat): Lost to Brad Lander, supported by progressive figures.
• Al Green (Texas Democrat): Lost to Christian Menefee due to redistricting.
• Julie Johnson (Texas Democrat): Lost to Collin Allred. Affected by redistricting.
• Thomas Massie (Kentucky Republican): Lost to Ed Gallrein. Criticized for opposing Trump’s agenda.

Upcoming Competitive Primaries

Several primaries remain, seen as potentially competitive. Justice Democrats have endorsed challengers like Donavan McKinney against Shri Thanedar and Mai Vang against Doris Matsui. In Rhode Island, Governor Dan McKee faces local issue-based unpopularity against Helena Foulkes.