Vice President Joe Biden accompanied by his wife Jill Biden enters a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)
John Mellencamp, center, performs before Vice President Joe Biden speaks during a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)
Supporters listen to John Mellencamp perform before Vice President Joe Biden speaks during a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)
John Mellencamp performs before Vice President Joe Biden speaks during a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)
Supporters listen to John Mellencamp perform before Vice President Joe Biden speaks during a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)
Vice President Joe Biden accompanied by his wife Jill Biden enters a campaign rally at the American Civil War Center at the Historic Tredegar Ironworks Monday, Nov. 5, 2012, in Richmond, Va. (AP Photo/Matt Rourke)
Vice President Joseph R. Biden embraces a patron at the Station 400 restaurant during a campaign stop on Wednesday, Oct. 31, 2012, in Sarasota, Fla. (AP Photo/Matt Rourke)
** FILE ** In this Dec. 13, 2011, photo, former Penn State assistant football coach Jerry Sandusky arrives for a preliminary hearing at the Centre County Courthouse in Bellefonte, Pa. (AP Photo/Matt Rourke)
Republican presidential candidate, former House Speaker Newt Gingrich, speaks to media during a news conference outside the Exciting Idlewild Baptist Church, Sunday, Jan. 29, 2012, in Lutz, Fla. (AP Photo/Matt Rourke)
Former House Speaker Newt Gingrich (left) talks with an unidentified man after arriving at Exciting Idlewild Baptist Church on Sunday, Jan. 29, 2012, in Lutz, Fla. (AP Photo/Matt Rourke)
Republican presidential candidate and former House Speaker Newt Gingrich gestures as he campaigns at The PGA Center for Golf Learning and Performance, Saturday, Jan. 28, 2012, in Port St. Lucie, Fla. (AP Photo/Matt Rourke)
Republican presidential candidate, former House Speaker Newt Gingrich speaks during Hispanic Leadership Network conference at the Doral Golf Resort and Spa, Friday, Jan. 27, 2012, in Miami, Fla. (AP Photo/Matt Rourke)
Former House Speaker Newt Gingrich, who won the South Carolina Republican presidential primary, laughs while speaking during a victory party on Saturday, Jan. 21, 2012, in Columbia, S.C. (AP Photo/Matt Rourke)
Former Pennsylvania Sen. Rick Santorum, accompanied by his wife, Karen (center right), son Daniel (left) and daughter Elizabeth (second left), speaks during a primary night rally on Tuesday, Jan. 10, 2012, in Manchester, N.H. (AP Photo/Matt Rourke)
Republican presidential candidate former Pennsylvania Sen. Rick Santorum gestures during a primary night rally, Tuesday, Jan. 10, 2012, in Manchester, N.H. (AP Photo/Matt Rourke)
Republican presidential candidate former Pennsylvania Sen. Rick Santorum accompanied by his wife Karen speaks during a primary night rally, Tuesday, Jan. 10, 2012, in Manchester, N.H. (AP Photo/Matt Rourke)
Republican presidential candidate former Pennsylvania Sen. Rick Santorum kisses his wife Karen during a primary night rally, Tuesday, Jan. 10, 2012, in Manchester, N.H. (AP Photo/Matt Rourke)