Here’s How Mamdani Made the 9/11 Anniversary All About Him and America Hate

John Fetterman taped a video — standing near a steel mill, because of course he was — to introduce Republican Sen. Dave McCormick to a hall full of Republicans in Dallas. He opened by confirming he is, in fact, a Democrat, which by that point in the evening was the only part anyone doubted. Then he explained why he was there: he’s a “common-sense Democrat,” he stands with America, and he rejects extremism and socialism.

He praised Trump and McCormick for defending the steel industry. He called McCormick a friend and said he gets things done. Then he handed the stage to a member of the opposition party, on their biggest night of the cycle, with fewer than eight weeks until November 3.

Set aside the party-switch chatter — Axios reports it’s flaring up again ahead of his 2028 race, and it’s the least interesting question here. Fetterman still votes with his caucus something like 95 percent of the time. His actual policy positions haven’t moved right. He isn’t becoming a Republican and conservatives shouldn’t pretend otherwise.

What he did is more damaging to Democrats than a defection would be.

Republicans have spent this entire cycle making one argument: that the Democratic Party has been captured by its socialist wing and no longer belongs to the people who used to vote for it. Democrats have spent the cycle insisting that’s a right-wing cartoon. On Wednesday, a sitting Democratic senator from the most important swing state in the country walked into the Republican convention and testified for the prosecution.

You cannot buy that. You cannot fake it. And there is no rebuttal, because the moment any Democrat attacks him for it, they prove his point on camera.

It isn’t unprecedented, just rare enough to matter. Zell Miller crossed over for Bush in 2004. Joe Lieberman — the party’s own vice presidential nominee eight years earlier — spoke for John McCain in 2008 because he thought Obama was too radical for the job. Tulsi Gabbard did it for Trump in 2024. Each time, the message was identical: I didn’t leave, they left, and here’s the proof.

The instructive part is what it says about the Democratic Party’s internal weather. Fetterman’s standing with Pennsylvania Democrats has cratered and he’s looking at a near-certain primary challenge in 2028. He’s being punished not for abandoning his votes but for refusing to abandon his manners — for treating a Republican colleague as a countryman rather than a war criminal. A healthy party would find room for that guy. This one is preparing to make an example of him.