Most of the Republicans, such as Lauren Boebert of Colorado and Victoria Spartz of Indiana, are incumbents in districts that President Trump won comfortably in 2024.

© Al Drago for The New York Times

Under its current rules, Wisconsin has not had a race in which a small number of donors have made up such a large share of a campaign’s funding.

© Valerie Plesch for The New York Times

Allies of Gina Hinojosa want a Democratic group to support her bid for Texas governor — putting pressure on its chairman, Gov. Andy Beshear of Kentucky, who is weighing a run for president.

© Christopher Lee for The New York Times