Both men were assertive from the outset, a reflection of the closeness of the presidential race just weeks before the election, each eager to trumpet the strengths of his ticket and equally zealous in ripping the other party.

Biden was aggressive, hoping to make up for President Barack Obamas tepid performance in his opening debate last week against Republican nominee Mitt Romney, a performance that reset the race and thrust the Republicans back into contention. Pressing to make his points, Biden at times raised his voice and jabbed his finger at moderator Martha Raddatz of ABC News.

Ryan was more measured, often lowering his voice after Biden. A fresh-faced congressman who had never debated on the national stage despite his 14 years in the House, Ryan betrayed no signs of nervousness about the showdown with Biden.

Debates by vice presidential candidates usually have little effect on elections, but Thursdays took on added significance after Obamas lackluster debate debut on Oct. 3.

Since then, Romney has pulled even with Obama in national polls and closed the gap in several battleground states.

In Florida, Romney opened up a 7 point lead, according to a new Tampa Bay Times/Bay News 9/Miami Herald poll. Obama has a 1 percentage point edge over Romney in a new NBC/Wall Street Journal/Marist poll of likely voters, released Thursday. The margin was the same as before the Obama-Romney debate. In Ohio, Obama leads by 6 points. He had led by 8. And in Virginia, Obama was up 2, but Romney is now ahead by 1.

In their sole debate, Biden and Ryan sparred repeatedly on domestic policies such as Medicare and taxes, as well as foreign policy questions such as the attack in Libya that led to the deaths of four Americans, including the U.S. ambassador.

Most covered the same ground as Obama and Romney. It was in their personal exchanges that they shed new light on the two major party tickets and their policies.

Both Irish Roman Catholics, Biden and Ryan spoke about how their religion drives their different positions on abortion.

Our faith informs us in every thing we do, Ryan said. He added that science also plays a role in his opposition to abortion rights in most cases, saying he and his wife were touched by the ultrasound image of their unborn first child.

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Biden, Ryan get personal in debate