LANCASTER, Pa - A presidential campaign that has largely been frozen for several months because of the coronavirus took on a degree of normalcy on Thursday when President Donald Trump and Democratic challenger Joe Biden swung through critical battleground states presenting starkly different visions for a post-pandemic America.Touring a shipyard in Marinette, Wisconsin, Trump insisted the economy is “coming back at a level nobody ever imagined possible.” But in Lancaster, Pennsylvania, Biden warned that “no miracles are coming" and slammed Trump's handling of the virus.“Amazingly, he hasn’t grasped the most basic fact of this crisis: To fix the economy we have to get control over the virus,” Biden said. “He’s like a child who can’t believe.