President Obama and Mitt Romney Battle for Ohio

ABC News' David Muir examines what the candidates need to do to win the contested state.
3:00 | 10/25/12

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Transcript for President Obama and Mitt Romney Battle for Ohio
And now, the race to the finish line in the long presidential campaign. President obama cast his vote today. They even double-checked his i.D. And tonight, our brand new abc news poll shows the two candidates close. Governor romney with a three-point lead tonight. And 12 days to go before americans get to the polls. Your voice, your vote. All roads are leads to one state, ohio. Abc's david muir is there to tell us why. David? Reporter: Good evening, diane. As you know, ohio could be the key to the presidency. The president needs it to hold on, mitt romney needs it to make the map work. That's why both candidates are tailoring their message to the voters here. And tonight, there's the ground game. We take you inside it all. Here in ohio, mitt romney receiving out where the stakes are highest. Given the math, whoever wins the buckeye battle will most certainly win the white house. The president mentioning ohio 16 times in one stop to date. Two weeks, ohio. Here in ohio. People of ohio don't forget. Reporter: And part of the president's playbook here, a tailored message for ohio. If mitt romney had been president when the auto industry was on the verge of collapse, we might not have an american auto industry today. The auto industry supports 1 in 8 ohio jobs. Reporter: Since june, the president has made 14 trips to ohio, the state he's visited most as a candidate. Mitt romney, even more since then. 15 times. But more than the message, it's the math here, the ground game. Hamilton county, the cincinnati area, obama won last time. Bull here at a romney field office, they want it back. Just listen. Programmed phones dialing voters, some of whom are undecided. This volunteer with three phones ringing at the same time. You have three phones going at once here? I do. Reporter: How do you know which one to pick up? Well, you just listen. Reporter: Waiting for a voice, she says, waiting to convince an undecided voter. Just miles away, there was an obama volunteer, his 14th day in a row knocking on doors. Talking to a voter through their upstairs window. I'm going to vote. Reporter: Even stopping a guy on a bike. I haven't voted yet. You going to do it? I am. I want you to leave me alone about it. Reporter: The stakes so high in ohio, the president even offering halloween candy. If anybody comes from ohio to the white house, they will get a hershey bar about this big. It will be like -- it will be huge. Reporter: Offering halloween candy to win here in ohio. Both campaigns watching the polls here in ohio very closely. The average showing president obama with a slight lead here. But the romney campaign pointing out to us today, they believe mitt romney doing very well among the independents. Diane? Okay, david, thank you. So, ohio could decide who wins

This transcript has been automatically generated and may not be 100% accurate.

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