Primary Elections in May 2026 Test President Trump's Endorsement Influence

In Indiana, seven Republican state Senate primaries are underway, focusing on candidates' alignment with the president. The outcomes in Indiana may provide early insights into voter preferences ahead of additional primaries later in the month. Polls close in both states on the evening of May 5, with results expected to shape discussions on party dynamics.

President Trump endorsed Letlow and posted criticism of Cassidy on Truth Social following the withdrawal of a surgeon general nominee. An Emerson College poll from the previous week showed Fleming leading by one point, with a potential runoff on June 27 if no candidate secures a majority.

Cassidy voted to impeach Trump after the January 6, 2021, events and has since expressed public support for him. Louisiana Governor Jeff Landry postponed House races due to a Supreme Court ruling on the state's congressional map, but the Senate primary proceeds as scheduled.

Trump and his allies support efforts to unseat Massie, who has previously opposed some of the president's directives.

President Trump has not endorsed in this race, which has involved significant spending and personal attacks between the candidates. Some Republicans view Cornyn as aligned with traditional party elements, while Paxton is noted for his support of Trump and faces ethical concerns.

The winner will compete against Democratic Texas State Representative James Talarico in the general election. Talarico raised $27 million in the first quarter of 2026, indicating strong financial support from national Democrats aiming for a statewide win in Texas.