Democratic Sen. John Fetterman of Pennsylvania, who won election despite a shaky debate performance hampered by a stroke, is sticking by President Joe Biden. As nervous Democrats and Never Trumpers call for Biden to leave the presidential race against Donald Trump because of his own debate debacle, Fetterman has emerged as a vocal and — at 6-foot-5 and 270 pounds — imposing Biden bodyguard. After Biden’s interview with ABC on Friday night, Fetterman apeared on MSNBC to scold Democrats who want to “panic and piss our pants.” Americans who have thrown away presidential votes away in protest were…