“I’m going to be going to Iowa, be going to Wisconsin, I’m going to Georgia, I’m going to Florida and maybe other places as well,” Mr. Biden said during a stop at a voter center in Chester, Pa.

And in a remarkably bold pronouncement for a Democratic presidential candidate, Mr. Biden declared that he would win Michigan, Wisconsin and Minnesota, three critical battleground states that might be his key to victory. He also said he thought he had a “fighting chance” in Ohio, North Carolina, Georgia and Iowa, states that were once thought to be a reach for Democrats but that recent polls indicate are now up for grabs…

It also comes as some Democrats have privately expressed concern about Mr. Biden’s relatively light schedule during the coronavirus pandemic even as he is leading in polls. He traveled to Pennsylvania on Saturday, but his only in-person appearance on Sunday was going to church near his home in Delaware. (He also made a brief appearance during a virtual concert held by his campaign.)