jenna: well, noon eastern time, and we're just hours away from the first vice presidential debate, first and only, by the way. the running mates are ready to rumble, and welcome to "happening now." i'm jenna lee. jon: i'm jon scott. all eyes on tonight's high stakes debate as vice president joe biden faces paul ryan, the republican who wants to take his job. it promises to be one of the closest presidential elections in recent history. biden and ryan square off for their first, their only debate. it takes place tonight on the campus of center college in danville, kentucky. mr. biden is hoping to put the brakes on the campaign after governor romney's strong showing in the first presidential debate. president obama saying yesterday that joe just needs to be joe. for mr. ryan, this will be his first nationally-televised debate. the up and comer knows biden is a veteran politician with more experience at these events, but he says biden cannot run from president obama's record. a fox news poll just out finds