We start with the brand new fuel that comes every four years on labor day as the presidential campaigns gear up for their final push. To give you an idea how crucial the battleground states are, where... See More
We start with the brand new fuel that comes every four years on labor day as the presidential campaigns gear up for their final push. To give you an idea how crucial the battleground states are, where this razor-thin race will be decided, just look over my shoulder tonight. Just since the republican convention, mitt romney has been to the battleground states of florida, ohio, and tonight he's up in new hampshire. President obama in iowa, colorado, and tomorrow in ohio. Tonight on the eve of the cratic convention, was there a bounce for mitt romney from his convention? Was there a bounce for mitt ey from his? A gallup poll suggesting otherwise. A dead heat tonight. Obama 47, romney, 46. Another daily pole that showed a convention bounce pushing romney into the lead, already has the two back at a tie. 45 even. What do the democrats have up their sleeves for their convention? Our power house political team covering it all tonight. We start with david kerley. Good evening. The president is appealing to those core groups in those all important battleground states. A couple of hours ago, a college campus in colorado. For both sides, their messages are coming into focus. Reporter: The president told the students the republican convention wasling outdated economic ideas. An agenda that was better suited for the last century. It was a rerun. It could have been on nick at night. We've seen it before. You might as well have watched it on a black and white tv with some rabbit ears. Reporter: Mitt romney was on the attack too, with his first weekend of college football providing a metta -- metaphor. One of the promises he made, he was going to create more jobs. Today 23 million people are out of work or stopped looking for work or underemployed. Let me tell you, if you have a coach that's zero and 23 million, you do say it's time to get a new coach? Another possible distraction for romney, reports that the new york attorney general is probing the tax practices of some of the country's biggest pockets of -- private equity firms, including romney's fornler firm, bain capital. Romney and his management, reportedly are not part of the investigation. Meanwhile, back on the trail, an indication of how close the race is, with the president imploring voters to vote early. He did so in iowa too. All right democrats hold a 3-1 advantage in early voters there where democratic registrations have dropped off since the president was elected. So what will you hear for the next 60-plus days? Listen up for this back and forth. We are going to help the american people and help the families in america. They have tried to sell us these tired, trickle-down, you're on your own policies before. Paul ryan and I have a plan that will get america working again. He did not offer a single new idea. A better future is ahead. Just re-dredge the same old policies. America will come roaring back. We've come too far to turn back now. We're taking this country back, that's why I'm asking for a second term. While democrats meet in charlotte, mr. Romney will be taking part in debate practice. And with the race so close, those debates could be critical this election season.
This transcript has been automatically generated and may not be 100% accurate.