The presidential and vice presidential nominees cast their ballots earlier Tuesday.
Sen. Barack Obama and his wife Michelle both voted in south Chicago as their daughters looked on.
"Voting with my daughters, that was a big deal," the Illinois senator said. "I noticed that Michelle took a long time though. I had to check to see who she was voting for."
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Democratic vice presidential nominee Joe Biden and his family voted in Wilmington, Del.
McCain in Arizona
Sen. John McCain cast his ballot in Phoenix, Ariz., with his wife Cindy by his side. He later held election day rallies in Colorado and New Mexico.
"We're going to be up late," McCain told a rally in Colorado. "The mac is back!"
McCain's running mate Alaska Gov. Sarah Palin also cast her vote in her home town of Wasilla, Alaska.
Palin told reporters she's optimistic.
"Tomorrow, I hope, I pray, I believe that I'll be able to wake up as Vice President-elect and be able to get to work in a transition mode with the President-elect John McCain," she said.
Now, all the candidates can do is wait for the results. McCain will watch returns come in from his home in Phoenix, while Obama watches election returns in Chicago.