GOP Sen. Bill Cassidy's primary loss in Louisiana shows the power of President Trump's opposition. It also highlights the importance of voting rules and maps.

Source: Election results and race calls are from The Associated Press. County type designations are based on a New York Times ...

Despite outspending his rivals, Cassidy finished third in the primary, falling short of even making a runoff. The outcome was ...

Sen. Bill Cassidy was decisively defeated in Louisiana’s Republican primary Saturday, failing to overcome backlash from GOP ...

The president's push to oust Republican lawmakers who have crossed him claimed its most prominent name yet in Louisiana this weekend, retiring Sen. Bill Cassidy.

Incumbent Republican Senator Bill Cassidy failed to qualify for the runoff election in Louisiana’s primary, marking a ...

Thomas Massie told George Stephanoupolos that he's confident he'll win his state's Republican primary, despite Donald Trump ...

President Donald Trump criticized Rep. Thomas Massie as "worse" than Sen. Bill Cassidy after Cassidy's primary defeat, ...

Suspects were being sought in at least 10 random weekend shootings in Austin, Texas, including at fire stations, that left ...

Rep. Julia Letlow, who had Trump’s endorsement, advanced to a primary runoff against state Treasurer John Fleming, NBC News ...

Sen. John Kennedy says Trump's endorsement had a "huge impact" in Louisiana's Senate race, where Rep. Julia Letlow topped ...

President Donald Trump called for Rep. Thomas Massie (R-KY) to be "thrown out of office" on Sunday in a Truth Social post ...