Sen. Kelly Ayotte, joined by Sen. Lindsey Graham and Sen. John McCain, discusses the attack on the U.S. Consulate in Benghazi, Libya, on Capitol Hill earlier this month. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Voters cast their ballots during the first day of early voting at the Meadows Mall on Oct. 20 in Las Vegas, Nev. David Becker/Getty Images hide caption

itoggle caption David Becker/Getty Images

McGovern listens to a constituent in 1974. Jim Mone/AP hide caption

itoggle caption Jim Mone/AP

Republican presidential candidate Mitt Romney lived in Stevens Hall while he was attending Cranbrook School in Bloomfield Hills, Mich. Bill Pugliano/Getty Images hide caption

itoggle caption Bill Pugliano/Getty Images

Paul Ryan addresses the Family Research Council Action Values Voter Summit in Washington, D.C., on Friday. Mandel Ngan/AFP/Getty Images hide caption

itoggle caption Mandel Ngan/AFP/Getty Images

Towns near the Ohio River, including Steubenville, seen here in 2009, are home to many undecided voters. One of them, Brian Snider, says, "This is pretty much a ghost town." Rick Gershon/Getty Images hide caption

itoggle caption Rick Gershon/Getty Images

Senate Majority Leader Harry Reid, D-Nev. speaks to the media at the Capitol in March. T.J. Kirkpatrick/Getty Images hide caption

itoggle caption T.J. Kirkpatrick/Getty Images

Ted Cruz, Republican candidate for the U.S. Senate, speaks at a rally organized by the Tea Party Express in San Antonio in May. Hernan Rozemberg/AP hide caption

itoggle caption Hernan Rozemberg/AP

Former Arkansas Gov. Mike Huckabee delivers remarks to the Conservative Political Action Conference in February in Washington, D.C. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Republican presidential candidate Mitt Romney makes a pie shell with store owner Linda Hundt during a campaign stop Tuesday in DeWitt, Mich. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

Iowans attend a marriage rally sponsored by The Family Leader on Tuesday at the Statehouse in Des Moines. The head of the organization says President Obama's endorsement of gay marriage could cost him the election. Charlie Neibergall/AP hide caption

itoggle caption Charlie Neibergall/AP

Vice President Biden defends the administration's foreign policy --€” and questions Mitt Romney's ideas — on Thursday at New York University. Lucas Jackson/Reuters/Landov hide caption

itoggle caption Lucas Jackson/Reuters/Landov

Republican presidential candidate and former Massachusetts Gov. Mitt Romney speaks at a campaign rally in Tempe, Ariz., on Friday. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP

Courting Tea Party voters in Philadelphia on Monday night, Mitt Romney speaks next to a large statue of Benjamin Franklin at the Franklin Institute. Tim Shaffer/Reuters/Landov hide caption

itoggle caption Tim Shaffer/Reuters/Landov