President Barack Obama and Republican challenger Mitt Romney have made their last-minute pitches to voters and now it's time for the voters to decide who's the best fit for the White House.
National polls had previously showed a neck-and-neck race and the winner will be determined by which man gets 270 electoral votes.
But in some of the key battleground states, including Ohio, Iowa and Wisconsin, that will decide the White House race, Obama appears to have a slight edge.
Obama closed down his campaign late Monday with a nostalgia-filled rally in Iowa, the state that jumpstarted his first presidential bid.
He'll spend Election Day in his hometown of Chicago, making his final appeals to voters in satellite interviews rather than a final flurry of campaign rallies.
He told supporters in Iowa, quote: "It's out of my hands now. It's in yours."
After voting near his Boston-area home, Romney visits airports in Cleveland and Pittsburgh on Tuesday, betting an 11th-hour appeal to working-class voters in Ohio and Pennsylvania will help him defeat President Barack Obama.
His running mate, Rep. Paul Ryan, is following a similar strategy, using his travel time after voting in his Wisconsin hometown to join Romney in Cleveland and then visit Richmond, Va.
The campaign isn't ruling out additional swing-state appearances as well.
Later, Ryan will await returns with Romney in Boston.
Polls in Virginia open at 6 a.m. and close at 7 p.m. Tuesday while polling locations in Maryland and D.C. open at 7 a.m. and close at 8 p.m.