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Sen. Tim Kaine was the first to vote, arriving with his wife, Anne Holton, at the Hermitage Methodist Home in his hometown of Richmond, Virginia, before the polling site opened at 6 a.m. Eastern time. He will head to New York later today to join Clinton and their supporters for the ballot count.
"I've been voting at this precinct for 24 years, and it's so nice to be able to walk over from our house," Kaine told reporters in Richmond. "We feel good. It's kind of like we've done all we could do. It's in the hands of the voters."
Clinton, the first woman to be nominated by a major party for president, was next spotted at the polls in her hometown of Chappaqua, New York. The Democratic candidate and her husband, former President Bill Clinton, cast ballots at the Douglas Grafflin Elementary School by 8 a.m. Eastern time. Clinton described voting for herself for president as "humbling."
"It is the most humbling experience because, you know, I know how much responsibility goes with this and so many people are counting on the outcome of this election," Hillary Clinton told reporters in Chappaqua. "I'll do the very best I can if I am fortunate enough to win today."
A few hours later in New York City, Donald Trump showed up to vote at his neighborhood polling location. Accompanied by his wife, Melania Trump, he arrived at P.S. 59 in midtown Manhattan around 11 a.m. Eastern time to cast his ballot.
"Tough decision," Trump told reporters when asked who got his vote. "We'll see what happens. It's going to be an interesting day."
Soon after that, Trump's running mate, Gov. Mike Pence, was seen voting in his hometown of Indianapolis. He went for a bike ride with his wife, Karen Pence, this morning before walking to a polling location across the street from the Indiana governor's mansion at St. Thomas Aquinas Parish, where the couple first met years ago.
"I was a freshman in law school. I came to this church on a Sunday morning, my first semester. I saw this brunette up front playing the guitar," he told reporters in Indianapolis. "Couldn't hear much of the sermon that day."
The Pences voted with their daughter Charlotte Pence, and the family embraced after casting their ballots around noon.
"A day like today is very humbling and very moving for our little family," he told reporters. "We're just so grateful for the support and prayers of people all across the United States."
ABC News' Gregory Croft, Ines de La Cuetara, Christopher Donato, Jessica Hopper and Meral Kathwari contributed to this report.