presidential election coming up on tuesday. It's "your voice, your vote." Just three days to go. And some people cannot wait. They're lining up for early voting, sometimes for up to three hours. Look... See More
presidential election coming up on tuesday. It's "your voice, your vote." Just three days to go. And some people cannot wait. They're lining up for early voting, sometimes for up to three hours. Look at the size of that line. Meanwhile, the candidates are out barnstorming the battleground states, where this extremely tight and unpredictable race will be won or lost. Abc's jake tapper is traveling with the president in mentor, ohio. Jake, good morning to you. Reporter: Good morning, dan. I don't want to cause any alarm. But I'm pretty sure ohio is going to be important this election cycle. You heard it here first. President obama did three events here yesterday. He went back home. In the immortal words of the pretenders, he came back to ohio. He'll do another event in ohio. In this mad 72-hour dash through the united states and to the finish line. Small towns in buckeye battleground, ohio. And all of them went after mitt romney for a tv ad here that falsely suggests local jeep jobs are headed to china, which the company denies. We don't want a of ads saying stuff that's not true. You don't scare hard-working americans just to scare up some votes. Reporter: The president's path from now until election day explain house he sees his path to election. New hampshire to florida to ohio to colorado. Wisconsin to iowa to ohio. That's three ohio. Hello, ohio. Reporter: If he wins here, iowa and wisconsin, it's game over. But the polls are increasingly tight. And 55% of the public still thinks the nation is on the wrong track. Stand tall, mr. President. God is with you. We are with you. Reporter: He can use that help. The president's doing what he can to rev up his strongest supporters from 2008, with similar themes. The last four years, the fought us every step of the way. What they're counting on now, is you're going to be so tired of all the dysfunction, that just give up. Just walk away. Reporter: He's making direct appeals, as well, on b.E.T., An ad with jay-z. What he represented to a nation of kids was hope. Reporter: In florida, a spanish-language ad. On monday, he will do three events with bruce springsteen. And, bianna, I want to tell you about this lineup tomorrow. Concord, new hampshire, with bill clinton. Hollywood, florida, with pit bull. And aurora, colorado, with dan's favorite, dave matthews. It's the other way around. I'm the dave fan.It bull fan. Reporter: I confuse you guys all the time. I'm sorry. I apologize. Jake, thanks so much. As jake mentioned, it's all about the battleground states and the eight, key races. Last night for mitt romney, it was all about ohio. Abc's david muir is with the romney campaign in newington, new hampshire. Good morning to you, david. Reporter: Good morning, bianna. We have kid rock on the romney campaign. We listened to him last night in ohio. In new hampshire, mitt romney holding a rally a short time from now. Voters know this is where his second home is. He was the governor of neighboring massachusetts. But the real sign of this campaign is not taking the four electoral votes for granted. As jake alluded to all eyes of the campaign on the states they're trulyeyeing. Overnight, mitt romney in the must-win state of ohio, his wife, ann, his five sons, his running mate. All of them echoed which state could decide t election. You know it. You're the battleground of battlegrounds. Reporter: Then, ann romney. Is ohio going to do it for us? Reporter: Then, the candidate himself. Your state is the one I'm counting on, by the way. This is the one we have to win. Reporter: On stage, a who's who of the republican party. A show of force in this race to the finish. Among them, former new york mayor rudy giuliani, who continued the criticism of the administration's handling of the attack in benghazi. I think some americans who did not have to die may have died because of incompetence in the white house. Reporter: Romney has not mentioned the situation in libya since the debate. That comes in stark contrast to the other this week. One of romney's supporters, republican governor chris christie, applauding the president. I'll reach out to both sides of the aisle. I'll reach across the aisle in washington. I'll endeavor to find those good men and women on both sides of the aisle. Reporter: Governor romney in new hampshire today. He'll be here on the eve of the election. The president here tomorrow. They are taking those four electoral votes very seriously. Particularly in a race, as you know, is a dead-heat as we head into election day. Hard to believe, only three days left. David, thank you. Joining us now for more on this is abc political consultant matthew dowd. Good morning, matt. Good morning. So curious to know who has the edge on tuesday? This marathon that has gone on 700 days. Everybody is ready for this thing. The candidates are exhausted. I think in the aftermath of what's gone on this week, there's a little wind behind the sails of the president, at this time. Especially in the electoral college. I think he has the advantage right now. You think sandy has that big of an impact? What sandy did was stop any momentum mitt romney had. And I think iconic pictures of the president, especially with the republican governor of new jersey. All of those pictures, I think, helped him just a little bit, in a race that's going to be decided by a few thousand votes. A half a point or a point can determine that. You have said, both sides here, both candidates of their huge blocks of supporters are convinced their guy is going to win. So, somebody is going to be sadly disappointed. Two candidates, two campaigns, and two aspects of the country that absolutely believe their candidate's going to win. We haven't faced an election like that in a long time. So, on election night, somebody the going to be gravely, gravely disappointed and shocked at the results. Matt dowd, such a pleasure to have you on. Thank you very much. Matt's going to be part of the powerhouse political roundtable to on "this week with george stephanoulos." On tuesday night, george and diane sawyer and the entire political team, including matt dowd, will be at election headquarters all night long. Full coverage as the results come in.
This transcript has been automatically generated and may not be 100% accurate.