Vice President Joe Biden and Wisconsin Rep. Paul Ryan will face off in their only head-to-head meeting of the presidential race tonight as the Democrats look for a boost after President Obama's lackluster effort in Denver last week and Republicans seek to maintain some momentum after Mitt Romney's command performance. Apart from what happens on stage this evening, ABC News Political Director Amy Walter points out that tonight's event comes on the heels of a round of new polls showing last week's debate did not completely transform the race, but it did provide Romney the opportunity to improve his battered image. In every state poll released today, Romney saw his favorables tick up -- not a lot -- but some. This means voters are now more receptive to what Romney has to say at the next debate.

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