Vice president Joe Biden waves to members of the media after casting his vote (AP)
US vice president Joe Biden has cast his vote in the 2012 election, saying "it's always a kick".
President Barack Obama's running mate said it is the eighth time he has run for election state-wide.
Asked if he thought it was the last time he would vote for himself, he told reporters: "No, I don't think so."
Mr Biden arrived with his wife, Jill, at a school in Greenville, Delaware, shortly after the polls opened and waited about 13 minutes.
Also accompanying the vice president were his son, Delaware attorney general Beau Biden, his wife Hallie and their eight-year-old daughter Natalie.
Mr Biden shook hands with and hugged other voters as he waited. He urged Americans to vote "even if you have to stand in line".