Danville, Kentucky (CNN) -- Vice President Joe Biden and Rep. Paul Ryan, GOP presidential candidate Mitt Romney's running mate, will share the stage in Danville, Kentucky, in their only debate. Biden and Ryan's debate follows the top of the tickets' first of three debates last week, in which Obama turned in a lackluster performance, upstaged by an aggressive and vibrant Romney. Here are five things to watch for on Thursday night: 1. Will Biden go where Obama didn't? Biden is not shy on the campaign trail; the day after last week's first presidential debate, the vice president attacked Republican nominee Mitt Romney in a way that many Democrats had wished President Barack Obama would have done the night before.
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Will Biden use the issues Obama avoided last week to take the fight to Ryan?
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Can "numbers guy" Ryan avoid the fiscal wonkery quicksand that sank Obama last week?
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Will Biden argue or avoid his ticket's differences with the Republicans on Social Security?
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Almost three decades apart, will the age gap between Ryan and Biden be a factor?
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But fiscal wonkery was quicksand for @placeholder during last week's debate.
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He's done a solid job of that since Romney put him on the @placeholder ticket in August.
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The @placeholder campaign scrambled to clarify last week that yes, in fact, the two candidates have fundamentally different views on Social Security.
Paul Ryan
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But at 69, he has almost three decades on @placeholder, his 42-year-old debate opponent.