Pennsylvania Sen. John Fetterman on Saturday accidentally declared himself a “lifelong Republican” — a slip by the Democrat whose moderate leanings have fueled months of speculation about a party switch.

Fetterman, 57, quickly laughed off his slip-up when the moderator at the Texas Tribune Festival event where he was speaking, Major Garrett, reminded him he was in fact a Democrat.

The senator, who has repeatedly faced questions about whether he’d abandon the Democratic Party, immediately acknowledged the likely viral nature of his goof.

“I guarantee you, that’s gonna break through,” Fetterman said.

Fetterman has spent months keeping the question…

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