Day before the election, polling continues to point to a Biden victory with leads in every swing state minus Iowa and Ohio.
On the eve of the election, Mr Biden has a 8.6-point national lead in polls, according to FiveThirtyEight, the poll tracking website. He also leads every swing state except Iowa and Ohio. In a sign of the headwinds facing Mr Trump, his rival leads in Georgia, which has not voted for a Democrat in almost 30 years, and the two men are neck and neck in Texas, which has not backed a Democrat since Jimmy Carter won in 1976.
All eyes on Pennsylvania, specifically Erie County where Trump was the first Republican to win since 1984.
One test will be in Erie County, north-western Pennsylvania. Nestled between Ohio and New York along Lake Erie on the border with Canada, it backed Mr Trump in 2016, the first Republican win there since Ronald Reagan in 1984. It was one of three counties in the state — and 206 in the US — that voted for Barack Obama in 2008 and again in 2012 but then swung to Mr Trump four years later, according to Ballotpedia.
Jim Wertz, the top Democratic official in the county, says local Democrats felt ignored in 2016. “Clinton was the first Democratic presidential candidate not to come here for a long time. People responded poorly to that,” he says, adding that blue-collar Democrats had been leaving the party even before the rise of Mr Trump.
She believes few Trump supporters would consider switching to Mr Biden even though the president has not delivered on all his pledges — such as bringing back coal jobs. “Even if they’re not feeling better off economically, they’re not going to jump ship. If you’re an American football fan, you’re not going to leave the Pittsburgh Steelers and become a Cleveland Browns fan.”
Laura Schisler, a Republican from suburban Pittsburgh, says Republican support for Mr Trump has soared since his first victory. “The energy now is absolutely incredible. Back then, everybody was afraid to say if they supported him. They were more in the closet. Now you’ve got people wearing big old Trump masks.”
Trump still lagging among suburban woman, attempting to woo the vote using surrogates.
In recent weeks, the president has dispatched his wife, his two daughters and former South Carolina governor Nikki Haley to Pennsylvania to woo Republican women. “Having the female surrogate out there is especially important. It’s the sisterhood argument. He realises he has a problem with suburban women,” says Ms Coopie.