With two debates down — and each side able to claim a victory — the final showdown on Monday between President Barack Obama and Mitt Romney will be the last major opportunity for each candidate to sway millions of voters at once.
With the polls showing razor-thin margins in the race, the debate at 9 p.m. EDT in Boca Raton, Fla., comes only 15 days before the Nov. 6 election. (Read More: Romney Still Trails Obama in 2 Key Swing States: Polls)
This faceoff has the best chance of all three debates for a big "gotcha" moment that many people have been waiting for.
"Because the focus of the debate is solely on foreign policy, it might be the least predictable in terms of what they say," said Stephen Medvic, a government professor at Franklin & Marshall College.
"Foreign policy is always a complex topic, and the chance to make a mistake is greater here than on other subject."
Think President Gerald Ford's infamous gaffe "There is no Soviet domination of Eastern Europe" in his 1976 debate against Jimmy Carter.
Romney and Obama touched on foreign policy during the town hall style debate at Hofstra University, specifically the deadly Sept. 11 attack on the American consulate in Benghazi, Libya. But Monday's contest will give voters the clearest view yet as to who they think is the better leader on global issues, said Norman Provizer, a political science professor at Metropolitan State University of Denver.
"If you're not sure as a voter who is best to be commander in chief, here's your opportunity," he said. "Each of them will get up there and try to say, 'I can run the country's overseas policies better than the other guy.' It will probably come down to who's more confident, Obama or Romney."
Besides Libya, other foreign policy issues will likely include the ongoing violence in Syria, the war in Afghanistan, China's economic programs, as well as Iran's nuclear program.
"These are all tricky questions for both of them but especially for Romney because he doesn't have any foreign policy experience," Medvic said. "For instance, he's said we should not have timetables for troop withdrawals to get out of Afghanistan but says we should be out by 2014, the same as the president. How does that work?'
This time, the traditional notion that Democrats are the weak ones in the foreign arena has been reversed.
"With Bin Laden dead, and Iraq pretty much over in the minds of voters, Democrats have a stronger foreign policy to point to than in the past. Usually, Republicans have claimed that mantel. They can't so much now," said Provizer.
If Romney has an opening, it might be how the administration reacted to the Benghazi attack that killed U.S. Ambassador Chris Stevens and three other Americans, said David Crockett, professor of political science at Trinity University.
"Romney missed an easy layup on Libya in the second debate by not forcing the issue on what kind of attack it was," said Crockett. "He could have pressed more on whether it was a terror attack or not."