Sen. John Fetterman (D-PA) on Friday hammered Democrats who are calling on President Joe Biden to drop out of the race after his widely panned debate performance on Thursday evening. Writing on Twitter, Fetterman pushed back at Democrats who are anonymously sniping at Biden and he used his own experience with a poor debate performance back in 2022 to emphasize that such moments do not doom campaigns. “I refuse to join the Democratic vultures on Biden’s shoulder after the debate,” he wrote. “No one knows more than me that a rough debate is not the sum total of the person and their record. Morni…