While vice-presidential debates typically don't have much bearing on the presidential contest, tomorrow night's Joe Biden-vs.-Paul Ryan showdown has put pressure on both sides. Team Obama NEEDS a strong performance from Biden to make up for last week and change the subject; another bad outing by a member of the ticket and the Democratic handwringing could turn into a full-fledged panic. Meanwhile, Team Romney needs a solid outing from Ryan to keep up the momentum. As we wrote last week, consider tomorrow night Game 2 of a baseball playoff series. After ace Romney beat ace Obama in Game 1, Democrats are looking for their No. 2 starter, Biden, to even the score. And Republicans are looking to go 2-0. That's what at stake Thursday, and that's why there's more pressure on Biden than on Ryan.