the scenes four years ago with sarah palin, donna brazile with vice president gore. And the polls show a split decision. One overnight poll, giving a small edge to ryan. Another one, a bigger edge to... See More
the scenes four years ago with sarah palin, donna brazile with vice president gore. And the polls show a split decision. One overnight poll, giving a small edge to ryan. Another one, a bigger edge to joe biden. One thing was clear. Joe biden did what democrats wanted him to do last night. No question, george. Joe biden came prepared. He came prepared to argue. He came prepared to debate. And he came prepared to be joe biden. Mularkey. He took all of the issues that president obama left on the floor last week. And said, you know what? I'm going to take that straight to the romney/ryan ticket. He didn't hesitate to attack them on their so-called budget plan, their tax plan. He was also, at times, when i thought he would become defensive on foreign policy, joe biden showed once again, he has the experience and had the information. And details matter. And joe biden provided those, too. You saw the romney campaign zeroing in on the smiles and laughs from joe biden. An interesting bar for success. Democrats feel because he ored what obama lost lt week, got them back to equilibrium. But that doesn't stop any threat for the momentum that romney was able to create from last week's debate. From the romney side, they felt they got their campaign in a good place last week. And paul ryan didn't do anything to jeopardize the forward motion they were able to put in place. The bottom line, how does this set the table for the presidential debate tuesday night? Last week, mitt romney tried to pivot to the middle. Joe biden pushed them right back to the far right where they've been all campaign season. Next week, president obama has to keep mitt romney back in that extreme position. And once again, tell the american people we can move forward. I think there's some substance on the table now. I think president obama will have to answer a line of questioning that martha raddatz opened up about what really happened in benghazi. What the administration knows. And there's a window and a possibility that in 90 minutes, the public will really start to wrap their brain around the possibility that the administration either misled the public or that there was some colossal intelligence failure that will be a factor in these closing weeks of this campaign. Nicolle wallace, donna brazile, thanks so much.
This transcript has been automatically generated and may not be 100% accurate.