Palin v Biden: The vice presidential debate

US Senator Joe Lieberman (left) , I-CT, speaks to people prior to the vice presidential debate between Gov. Sarah Palin and Sen. Joseph Biden at Washington University in St. Louis, Missouri.  (AFP/Getty Images photo by Robyn Beck)

Republican vice-presidential candidate Sarah Palin, with husband Todd, leave Flagstaff, Arizona en route to St Louis, Missouri where she will face off with her Democratic counterpart Sen. Joe Biden in their one and only debate.  (AFP/Getty photo by Robyn Beck)

Moderator Gwen Ifill is assisted to the set in a wheelchair at Washington University in St. Louis for a look at the set where vice presidential candidates Joe Biden and Sarah Palin will debate. Ifill recently took a spill in her home injuring her ankle.  (AFP/Getty photo by Paul J. Richards)

Students from Washington University in St. Louis shake hands as they pretend to be vice presidential candidates Sen. Joe Biden, and Gov. Sarah Palin during a lighting and sound rehearsal. Another student, with back to camera, pretends to be moderator Gwen Ifill.  (AFP/Getty photo by Paul J. Richards)