Tulane Political Science Professor Tom Langston says Thursday night's first and only vice-presidential debate between Paul Ryan and Joe Biden ended with no clear winner.

"Both candidates performed very aggressively, they really hammered away at one another," Langston said. "It seemed that both candidates were extremely well prepared, very energetic and did a nice job presenting their bosses' points of view."

Langston also says he's not surprised that initial polls disagree on who won the debate, as it's such a close race.

As for Biden's demeanor, Langston says it's understandable, because of the vice-president's age and his tenure as a U.S. senator, that he would look down on the younger Ryan, but Biden went a bit far.

"He was derisive, mocking and he even flashed his anger at the moderator, so I was a little surprised by that," Langston said.

Langston agrees that with the race tighter than it was two weeks ago, the VP debate is not likely to result in a significant shift toward either Obama or Romney but is likely to raise the stakes when the two meet next week for their second forum.