Republican challenger Mitt Romney will cast his ballot with the rest of the nation Tuesday as he heads to Boston for the last night of the campain.
President Obama, who voted early, arrived in Chicago last night, while Romney made one last stop in his bid to take the White House.
Romney's 24-Hour Finale
The past 24 hours have been a wild ride for Romney. He campaigned in four battleground states, including New Hampshire, where the former governor took the stage before 10,000 enthusiastic supporters.
"You hoped President Obama would live up to his promise to bring people together to solve the big problems. He hasn't. I will," Romney vowed, drawing waves of applause from the audience.
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While huge rallies look great in person and on TV, the Romney campaign knows the key is getting those voters to the polls.
Consequently, they will be using some sophisticated software on Election Day. An app on campaign workers' phones, called the Orca Project, will tell them "who" is voting "where" around the country.
As that information comes into election headquarters, campaign staff can then direct last-minute phone calls and door knocks to specific underperforming areas to get out the vote.
In the meantime, Romney supporters, like Suzanne Bonanno and David Schur, are fired up and ready to go.
"I'm married, and I have a couple of kids, and I'm excited about a new leader in our country," Bonanno said. "Mitt Romney is going to do a great job. I'm proud of his whole entire message."
"I feel pretty excited," Schur said. "I feel pretty good that Mitt Romney has got the momentum, and I think he's going to do it. I also feel it's about time the campaign is over."
Multiple sources with the Romney campaign told CBN News they think they can win North Carolina and Florida. If they lose Ohio, they believe they can win Wisconsin instead.
They also say don't be surprised if Minnesota goes into the Romney victory column. Such a development could be the biggest 'gotcha' of the night -- in a state that hasn't gone in the Republican column in a presidential election in 40 years.
Watching and Waiting
Meanwhile, President Obama and the first lady are taking shelter at home in the Windy City, waiting for the results of a hard-fought contest.
On the final day of his campaign, the president chose Ohio, Wisconsin, and Iowa to make his closing arguments.
His pitch: telling voters he's spent his first term fighting for change.
"You've seen the scars on me to prove it," Obama told supporters Monday. "You've seen the gray hair on my head -- to show you what it means to fight for change."
His get-out-the-vote machine has even drawn praise from Republicans. Volunteers at the Obama campaign's Chicago field office are in overdrive.
"It has been nonstop," Obama campaign volunteer Cathy Yoshimura said.
Every few minutes a half dozen volunteers pour in, some making plans to canvas battlegrounds in Wisconsin and Iowa and others, like Bjorn Danbolt, making endless phone calls.
Danbolt can't vote today because he's Norwegian. Still, he flew here two weeks ago to volunteer. He believes Obama has improved U.S. relations abroad with European and Muslim leaders.
"It's critical that that path is continued because I think many back home in Norway and Western Europe also really oppose many of Mitt Romney's policies," he said.
Cathy Yoshimura recently moved to Chicago from Ohio. She said she's working to help battleground voters "see the light."
"My friends are back in Ohio and they're doing the same thing," Yoshimura said.
"They're trying so hard and they've asked. I thought I was going to go back and help them' and I said, 'No, you can do it, I know you can do it.' 'So sorry,'" she said, dissolving into tears.
Four years ago the president claimed his historic victory at Chicago's Grant Park before hundreds of thousands of proud supporters. But you can expect them to raise the roof if Obama wins a second term in the White House.