Democrat supporters wait to watch Barack Obama speak at a "Get Out the Vote" rally as he campaigns for Joe Biden in Atlanta, Georgia, on 2 November 2020. Photo by Elijah Nouvelage / AFP

Trump supporters gather in the Regal Greenwood & RPX Cinema car park ahead of a parade around Interstate 465 in Indianapolis. Photo by Jeremy Hogan / SOPA Images / Shutterstock

Anti-Trump protesters demonstrate outside the White House ahead of the 2020 elections. Photo by Yegor Aleyev / TASS

Little Sisters of the Poor wait for Donald Trump to speak in a "Make America Great Again" rally in Washington, Michigan, on 1 November 2020. Photo by Brendan Smialowski / AFP

A Donald Trump supporter wears a "Blacks for Trump" T-shirt at a rally in Florida on 2 November 2020. Photo by Brendan Smialowski / AFP

Joe Biden speaks during a campaign rally in Saint Paul, Minnesota. Photo by Pavlo Gonchar / SOPA Images / Sipa USA

Joe Biden addresses supporters in Warm Springs, Georgia, on 27 October 2020. The candidates have taken different approaches to campaigning during the Covid-19 pandemic. While the Biden campaign has implemented social distancing measures, as in the photo above, the Trump campaign has allowed large numbers to gather at rallies. Photo by Brian Snyder / Reuters

People wait for Donald Trump to speak at a rally at the Hickory Regional Airport on 1 November 2020 in North Carolina. Photo by Michael Ciaglo / Getty Images

Families turn out at a Donald Trump rally in Londonderry, New Hampshire. Photo by Leah Millis / Reuters

Donald Trump dances at a "Make America Great Again" rally at Richard B Russell Airport in Georgia on 1 November 2020. Photo by Brendan Smialowski / AFP

A young boy listens as Joe Biden speaks at a "Get Out the Vote" event in Philadelphia, Pennsylvania, on 1 November 2020. Photo by Drew Angerer / Getty Images

Lady Gaga performs at a Joe Biden drive-in campaign rally in Pittsburgh, Pennsylvania, on 2 November 2020. Photo by Drew Angerer / Getty Images

A Japanese manufacturer in Saitama, north of Tokyo, makes rubber masks of Donald Trump and Joe Biden in October 2020. Photo by Yasuhiro Ogawa / JIJI PRESS / PA

Former president Barack Obama speaks at a drive-in campaign rally for Joe Biden in Detroit, Michigan, on 31 October. Photo by Drew Angerer / Getty Images

Trump merchandise is sold at a roadside vendor's stand in Pittsburgh, Pennsylvania. Photo by Al Drago / Bloomberg

Trump supporter Daniel Kulick in York Springs, Pennsylvania. Photo by Philippe de Poulpiquet / Maxppp / PA

Donald Trump during a campaign rally in Butler, Pennsylvania, on Halloween. Photo by Carlos Barria / Reuters

An attendee at a Trump rally in Rome, Georgia, wears a "fake news" T-shirt. Photo by Elijah Nouvelage / Bloomberg

Democratic Representative Lucy McBath leads a chant at a "They See Georgia Blue" campaign event in Suwanee, Georgia, on 31 October 2020. Photo by Brandon Bell / Reuters

Trump supporters arrive at a rally on 1 November in Washington, Michigan. Photo by John Moore / Getty Images

A voodoo doll of Donald Trump sits on the bonnet of a car during a drive-in campaign rally for Joe Biden at the Iowa State Fairgrounds. Photo by Drew Angerer / Getty Images

Trump supporters rally in the city of Beverly Hills where they marched up and down Rodeo Drive. Photo by Ted Soqui / SIPA

Trump supporters gather with flags in the Queens borough of New York City on 1 November. Photo by zz / STRF / starmaxinc.com / Starmax /PA

The Detroit Youth Choir dances to Stevie Wonder at a drive-in rally for Joe Biden on Belle Isle. Photo by Dominick Sokotoff / Shutterstock

A cowboy hat held up for the arrival of Donald Trump at Miami-Opa Locka Executive Airport on 1 November. Photo by Joe Raedle / Getty Images

Barack Obama and Joe Biden greet each other with a socially distant "air" elbow bump at the end of a drive-in campaign rally in Flint, Michigan on 31 October. Biden campaigned with Obama in the battleground state, which President Donald Trump narrowly won in 2016. Photo by Drew Angerer / Getty Images

A trailer in Somerset, Pennsylvania. Photo by Al Drago / Bloomberg

A young girl blows bubbles during a campaign event for Kamala Harris in Phoenix, Arizona. Photo by Edgard Garrido / Reuters

A supporter strips off at a Trump rally in Waterford Township, Michigan. Photo by Shannon Stapleton/Reuters

Campaign signs sit in the front garden of a home in Kenosha, Wisconsin. Photo by Scott Olson / Getty Images

A beacon lights up the skyline from the Paramount Miami Worldcenter skyscraper, calling for voters to turn out to vote. Photo by Bryan Glazer / AP