Joe Biden traveled Saturday to a union hall in Erie, where he pledged to fight for working-class Americans and rebuild the economy from the devastation of the coronavirus pandemic. “America deserves a president who understands what people are going through,” Biden said. “You’re facing real challenges right now, and the last thing you need is a president who exacerbates them.” Biden’s trip to Erie was his latest swing through parts of Pennsylvania that shunned Democrats four years ago. Erie County was one of three in Pennsylvania that backed President Barack Obama before swinging to Trump in 2016, breaking from its...