The parties reaction to this will be telling. Anything less than expulsion from the party is unacceptable. Her being the neoliberal establishment pick, even if she was clearly defeated. Makes me wonder if they're just going to try to burn it all down on the way out.

“Congresswoman Stevens is not a current member of the Michigan Democratic Party, nor will she be in the future,” Michigan Democratic Party Chair Curtis Hertel wrote on X Sunday.

source

What OP said, but also parties in America don't get to control their membership. Anyone can run as a candidate of any party if they can win the primary.

Well, she'd have to be elected first. She lost her primary to El-Sayed. But you're right.

Exactly. Schumer -- the epitome of a corporate Dem -- supported Stevens in the primary, and today is calling her flip a "despicable betrayal," but until today his support for El-Sayed as the Dem candidate has only ever been unenthusiastic at best.

Even the dems are sick of her shit - they kicked her out of the party right before she made this endorsement.

also bodes well for El Seyed being the man we hope he is

No. She is the incumbent and still in office. She lost to Abdul in the primary though and has refused to endorse him unless he sucked fascist cock [paraphrased but that's what she essentially demanded]. He told her to pound sand and she went over to support Abdul's republican opponent in the general.