LANCASTER, Pa. — A presidential campaign that has largely been frozen for several months because of the coronavirus took on a degree of normalcy 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, Wis., Trump insisted the economy is “coming back at a level nobody ever imagined possible.” But in Lancaster, 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 this has happened to him. His whining and self-pity.”

With just over four months until the election, the contrasting styles of Trump and Biden are on display. Trump is itching to move past an outbreak that has dashed the economy and killed more than 120,000 people. Biden, meanwhile, is seeking to present himself as a competent and calming leader ready to level with the nation about the hardships that may be required to emerge from the current turmoil.