And now, we turn to the race for the white house. These pictures say it all. The candidates and their running mates and their wives, all out, all going full throttle, trying to win over just a tiny... See More
And now, we turn to the race for the white house. These pictures say it all. The candidates and their running mates and their wives, all out, all going full throttle, trying to win over just a tiny number of people in those battleground states who could be the ones who decide it all in 18 days. When americans go to the polls, it's your voice, your vote. And abc's david muir has a question and an answer for all of us. In this blizzard of polls, as of tonight, who would win this race? Reporter: President in virginia today, women filling the backdrop and a new attack line. If you say you're for equal pay for equal work, but you keep refusing to say whether or not you'd sign a bill that protects people pay for equal work. You may have romnesia. Reporter: Late today, mitt romney boarding a plane for florida, after hours in debate prep. But with new polling sending mixed signals, who is really winning this race right now? Everyone at home keeping score, who is winning the race tonight? Obama. Reporter: By how much? Not by much. We think he might be up by one point nationally and two points in the most important battleground states. Reporter: In the political word, nate silver is known as a numbers wit, for his blog in "the new york times." The answer so why he thinks the president is winning right now lies in the battlegrounds. Look at this. Just one key scenario. If the president can hold onto his leads in ohio, wisconsin and iowa, and he'd have the electoral map to win. In fact, romney could sweep six other swing states and it still would not be enough. Nate's math also takes into account the stock market, the unemployment rate. And just today, we learned in seven key swing states, unemployment dropped, including the must-win state now for both campaigns, ohio. Overnight at the al smith dinner a tradition to bring both candidates together. The president, jokingly asked this. In less than three weeks, voters in states like ohio, virginia and florida will decide this incredibly important election which begs the question, what are we doing here? Reporter: And romney, with his own take on the polls. When suddenly I pulled ahead in some of the major polls, what was the headline? Polls show obama leading from behind. And I've already seen early reports from tonight's dinner. Headline -- obama embraced by catholics. Romney dines with rich people. Reporter: That's pretty good last night. I spent some time on the phone with the romney campaign today and that notion of a mid western fire wall, they don't buy it. They say they're going to win iowa. They say it's razor thin in ohio. And get this, diane. I asked nate, the math whiz, if the election were tonight, how many states would go into a recount, he said two to three states in a recount automatically. Going to be a very long night. That close. Thank you, david. And a reminder, on sunday, george stephanopoulos and his headliners will be here. Chicago mayor rahe emanuel and senator more coe rube yo from florida, tackling it all on "this week."
This transcript has been automatically generated and may not be 100% accurate.