Martha Rad­datz, mod­er­a­tor and light­ning rod.

Tonight is the only Vice Pres­i­den­tial debate of the 2012 elec­tion, mod­er­ated by Martha Rad­datz of ABC News. The venue is Cen­tre Col­lege in Danville, Kentucky.

The stakes for tonight’s con­test were raised by Pres­i­dent Obama’s per­for­mance in the first Pres­i­den­tial debate, which most pun­dits regarded as lack­lus­ter. Accord­ingly, the pre-​​debate pos­tur­ing has begun.

The Daily Caller and Tucker Carl­son have claimed that Rad­datz has a con­flict of inter­est because Barack Obama attended her 1991 wed­ding to Julius Gena­chowski. At the time, both Obama and Gena­chowski were Har­vard law stu­dents. Rad­datz and Gena­chowski were divorced in 1997, and Rad­datz is now mar­ried to NPR cor­re­spon­dent Tom Gjelton.

The Democ­rats will try to cut off the Repub­li­can team’s momen­tum that they gained from the Den­ver Pres­i­den­tial debate. Biden’s exten­sive for­eign pol­icy expe­ri­ence and four years of inten­sive, on-​​the-​​job train­ing as a val­ued advi­sor and assis­tant to Obama are his strengths.

On the Repub­li­can side, Ryan will try to close the deal. He has been in Con­gress 14 years, and has worked in pub­lic ser­vice his entire adult life (with the excep­tion of a stint at the wheel of a Wiener­mo­bile). He now chairs the House Bud­get Com­mit­tee and is the prin­ci­pal author of the Repub­li­can plan to cut the deficit, pri­mar­ily by repeal­ing Oba­macare and replac­ing the cur­rent Medicare fund­ing sys­tem with a voucher-​​based fund­ing model.

Biden comes into the debate strug­gling, even though he needs to make up some polling ground lost by Obama in his own debate. It’s an uphill climb, because Biden’s favor­a­bil­ity rat­ings are under­wa­ter, with 39 per­cent of vot­ers view­ing him favor­ably vs. 51 per­cent unfa­vor­ably (a –12 net) in a recent Pew poll. Ryan’s num­bers are 44 per­cent favor­able vs. 40 per­cent unfa­vor­able, or a +4. Forty per­cent of those sur­veyed by Pew dur­ing the first week of Octo­ber expect Ryan to do bet­ter, while 34 per­cent expect Biden to do better.

What will the Fri­day morn­ing head­lines read?

Will Joe Biden stick his foot in his mouth with one (or more) of his trade­mark gaffes?

Will Paul Ryan lie about his sub-​​3 hour marathon time, his 6 per­cent body fat, climb­ing Colorado’s Four­teen­ers, or some other act of phys­i­cal prowess? Will Ryan start off by ask­ing “Hey, can I call you Joe?

We have Dis­qus turned on today so that we can han­dle the live traf­fic for tonight’s debate, which starts at 9:00 PM EDT (6:00 PM PDT). Join us and comment.