Republicans catch the Trump strain of tea party fever

Key Points:

• For the past 15 years, incumbent GOP senators rarely lost primaries, with only two falling victim to conservative challengers, aided by party efforts and Donald Trump's protection of incumbents.
• This spring, two incumbent senators, John Cornyn of Texas and Bill Cassidy of Louisiana, lost their primaries within 10 days, marking a significant shift fueled by Trump's interventions and reflecting ongoing anti-establishment sentiment in the GOP base.
• Cornyn lost by a large margin to Trump-endorsed Ken Paxton, while Cassidy, who voted to convict Trump in 2021, was eliminated early, both outcomes underscoring the party's loyalty tests replacing previous ideological feuds.
• Senator Lindsey Graham is currently contending with a strong primary challenge, despite Trump's criticism of his opponent, highlighting the persistent internal unrest and the risk of divided resources ahead of the general election.
• The GOP faces risks similar to past cycles where anti-incumbent insurgents won primaries but weakened the party's chances in general elections, exemplified by Paxton's legal troubles and the competitive Texas Senate race against Democrat James Talarico.