Still, not everyone who opposed the major candidates in 2016 wants to pick a side yet.
“It’s an unbelievably bad choice twice now,” said Richard Vinroot, a Republican former mayor of Charlotte, N.C., who opposed Mr. Trump and Mrs. Clinton in 2016, and will not vote for Mr. Trump or Mr. Biden this year. “I’m very disappointed in the choice that we have.”
The Trump campaign hopes to fuel perceptions that Mr. Biden and the Democratic Party are too radical, seeking to link Mr. Biden to the most progressive voices in his party at a moment of national unrest over racism and policing.
“Our data shows that a lot of people know of Joe Biden, but not very many know much about him,” said Tim Murtaugh a spokesman for Mr. Trump’s re-election campaign, calling Mr. Biden “incapable of standing up to the most extreme elements in his party.”
“By Election Day, voters will be aware of that,” he said.
Yet polling shows that it is Mr. Trump who is out of step with much of the country on issues of racial justice. And Mr. Biden, who has supported protesters of police brutality, has also rejected the most far-reaching measures proposed by some in his party — he opposes defunding the police, for example.
Back in Arizona, Barbara Hill, 85, reflected on her 2016 vote.
“I voted for somebody else on the ballot,’’ she said. “I wasted my vote, in other words, but I couldn’t stand either one of them.”
This time, she said, she will be voting for Mr. Biden.
Nate Cohn contributed reporting.