Sen. John Fetterman doubled down in his support of President Biden after his ABC interview Friday, condemning efforts by his fellow Democrats to shove the octogenarian commander-in-chief out of the race. “Democrats need to get a spine or grow a set — one or the other. Joe Biden is our guy,” Fetterman said in a terse posting on X. The terse comment reiterated the Pennsylvania ragamuffin as a ride-or-die for Biden, even as a growing number of elected Democrats moved to abandon him after his disastrous debate against Donald Trump last week. “I’m unwilling to discard a great president, a...