The fight for the presidency comes down to millions of uncounted mail ballots in battleground states

youth vote early ballot
In this photo illustration, a pencil lies on a U.S. presidential election mail-in ballot received by a U.S. citizen living abroad that shows current U.S. Republican President Donald Trump and his main contender, Democratic presidential candidate Joe Biden, among the choices. Thousands of U.S. citizens living abroad have received their mail-in ballots via e-mail already. Photo by Sean Gallup | Getty Images