The Democrats who think they can beat Donald Trump had a party. I went

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About an hour and a half into “WelcomeFest”—last week’s “largest public gathering of centrist Democrats,” self-described—the inevitable happened. Protesters against the Israeli military campaign in Gaza breached the check-in area and took the stage to condemn New York Rep. Ritchie Torres, who had been speaking. “Free Palestine,” they chanted, as if on cue.

The event organizers were clearly prepared. They blasted the song “You’re So Vain” by Carly Simon as the protesters were muscled out of the room with speed that Majorie Taylor Greene might envy . The Democratic attendees, thrilled, leaped up for a standing ovation.

“My greatest superpower is that I’m so socia