A Michigan Democratic congresswoman blindsided her own party by endorsing her Republican opponent days before the election, and the backlash has been swift.

Haley Stevens, who lost her party's Senate primary to Abdul El-Sayed, abruptly endorsed Trump-backed Republican Mike Rogers without telling her staff or colleagues. Former staffers say she had long been close to AIPAC and foreign-policy donors, and many believe sour feelings over losing the primary — not policy — drove the switch.

The Michigan Democratic Party moved fast, with its chair publicly declaring she is no longer a member and never will be again. Former staff members resigned in protest, and Democratic voters online are calling her a traitor who sold out the party over a personal grudge.

The episode is landing in a tense political moment, with Trump making erratic remarks on the campaign trail and a separate deadly private jet crash near Mar-a-Lago adding to a chaotic news cycle. Ordinary voters venting in the clips reflect how raw emotions are running over the war in Gaza, foreign spending, and the cost of living.

Outlook: Expect Stevens' defection to become a cautionary flashpoint in Democratic primary politics, with the party likely to make an example of her ahead of future races.