"World News Tonight" anchor David Muir asked ABC News Chief White House Correspondent Jonathan Karl, who watched the dueling town halls, if the separate appearances moved the needle for people who were undecided.

Karl said that there are so few Americans who are undecided at this point.

"This is such a strange campaign. We have heard very little from either of these two men on about what they would actually do over the next four years," Karl said

Karl noted that after dodging questions on his stance on expanding the Supreme Court, Biden answered Thursday night after being pushed by Stephanopoulos.

"We have what appears to be a commitment that after the Amy Coney Barrett vote, he will tell the American people. He said voters have the right to know where he stands," Karl said.

During Trump's town hall, the president didn't answer a question from a voter on his plan for rising health care costs, something Karl said the president had four years to come up with.

"It was abundantly clear that he has absolutely no plan. This is something he's had four years, nearly four years in office, to come up with," Karl said.

"He basically said that what he has done is he's done away with the individual mandate with Obamacare, and then talked a little more about Obamacare is not a good thing, and we need something better, but absolutely nothing about what he'd actually do on health care," he added.

BIDEN'S CLAIM: "My deal is a crucial framework, but not the New Green Deal."

FACT CHECK: In addition to misstating the name of the Green New Deal, Biden was incorrect in how he laid out his view of the plan compared to how it is stated on his own campaign website.

"Biden believes the Green New Deal is a crucial framework for meeting the climate challenges we face," his website reads.

While Biden has said he does not support major aspects of the Green New Deal, his own plan calls for moving the nation's power system to net-zero emissions by 2035, a more ambitious timeline than his original climate plan laid out, which has been praised by progressive activists.

The Green New Deal was a resolution that laid out a broad framework for climate action but would not have changed any policies if it had passed.”

In one major distinction from that framework, Biden said he does not think it would be possible to completely eliminate fossil fuels by 2030, saying the country will need to be able to transition to more investments in renewable energy while improving sources that can release greenhouse gas emissions like natural gas.-ABC News' John Verhovek and Stephanie Ebbs

ABC News senior congressional correspondent Mary Bruce said viewers saw something that they haven't seen very often due to the pandemic: Biden interacting directly with voters.

"His campaign feels he shines in these moments, that he does best when he is able to speak directly with voters," she said.

"There was a lot of deep diving that he was doing into his policy proposals going forward. This was a night largely about Joe Biden and, actually surprising, not a lot about his opponent," she added.

BIDEN'S CLAIM: "I do not propose banning fracking. I think you have to make sure that
fracking is, in fact, not admitting methane or polluting the well or dealing with what can be small earthquakes and how they're drilling. So it has to be managed very, very well, No. 1. No. 2, what we have to do is the future rests in renewable energy."

FACT CHECK: Biden said he does not support a ban on fracking, the shorthand for the process of extracting natural gas, but he does support limiting its environmental impact, blocking its use on public lands and putting more focus on renewable energy.

The debate around fracking has focused on whether a candidate would "ban" the entire industry, but a president would only have the power to stop issuing new leases for oil and gas activity on public land, not activity on private property.

Biden has said that he doesn't want to add new fracking on public lands. He has said he wants to move away from fracking and focus on more renewable energy sources to eventually get net-zero emissions, including preventing the release of the methane from natural gas activity.

He has also argued that a transition to clean energy is necessary to keep people employed and that it won't be possible to immediately eliminate all fossil fuels, including natural gas.

Biden's environmental plan calls for an end to fossil fuel subsidies and for a massive investment in clean energy, including training fossil fuel workers for clean energy jobs.

-ABC News' Stephanie Ebbs and Averi Harper

Angelica Politarhos, a Republican voter from Garnett Valley, Pennsylvania, asked Biden about his view now on the 1994 Crime Bill.

"Things have changed drastically," the former vice president said. "That crime bill, when we voted, the black caucus voted for it, every black mayor supported it across the board."

When Stephanopoulos asked Biden if it was a mistake to support the bill, he said the mistake occurred at the state level.

"The mistake came in terms of what the states did locally," he said. "What we did federally, we said it was -- you remember, George, it was all about the same time for the same crime."

Stephanopoulos also asked Biden about previously saying that more police meant less crime. Biden said that only works if those police officers were doing community policing.

"We had community policing from the mid '90s on until -- until (George W.) Bush got elected, what happened? Violent crime actually went down," Biden said.

"The cops didn't like it," he added. "They didn't like the community policing because you had to have two people in a vehicle. They had to get out of their cars."

Biden went on to call for de-escalation training for police. "So instead of anybody coming at you and the first thing you do is shoot to kill, you shoot them in the leg," he said.

He also called for psychologists to accompany police officers on calls where mental health is a factor.