South Dakota Sen. John Thune waves to delegates during the Republican National Convention in Tampa, Fla., on Wednesday. J. Scott Applewhite/AP hide caption

itoggle caption J. Scott Applewhite/AP

Rep. Todd Akin, R-Mo., says Rep. Paul Ryan, R-Wis., the GOP vice presidential candidate, asked him to end his Senate bid after recent comments he made referring to "legitimate rape." Jeff Roberson/AP hide caption

itoggle caption Jeff Roberson/AP

President Clinton signs the welfare reform law on Aug. 22, 1996. Stephen Jaffe /Reuters /Landov hide caption

itoggle caption Stephen Jaffe /Reuters /Landov

Rep. Paul Ryan greets supporters during a campaign rally Sunday in Waukesha, Wis. Saul Loeb/AFP/Getty Images hide caption

itoggle caption Saul Loeb/AFP/Getty Images

Connecticut GOP Senate candidates Rep. Christopher Shays and Linda McMahon shake hands at a June 14 debate in Storrs. State Republicans vote Tuesday on which candidate will move on to the general election. Stephan Savoia/AP hide caption

itoggle caption Stephan Savoia/AP

CNN's Candy Crowley at a Mitt Romney campaign event during the Iowa caucuses in January. David Holloway/CNN hide caption

itoggle caption David Holloway/CNN

What a difference 14 years makes. Here, Bill Clinton departs the White House on July 31, 1998, after telling reporters he wouldn't take questions about the Monica Lewinsky investigation. Tim Sloan/AFP/Getty Images hide caption

itoggle caption Tim Sloan/AFP/Getty Images

President Obama delivers remarks at a campaign event on July 5 in Parma, Ohio. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

Ted Cruz, left, and David Dewhurst shake hands before their Republican Senate debate in Dallas on June 22. LM Otero/AP hide caption

itoggle caption LM Otero/AP

President Obama speaks at the Fox Theater in Oakland, Calif., on Monday. Saul Loeb/AFP/Getty Images hide caption

itoggle caption Saul Loeb/AFP/Getty Images

Will these Green Bay fans be cheering as much as they did during the 2011 Super Bowl when their beloved Packer games are interrupted by local political ads this fall? Matt Ludtke/Getty Images hide caption

itoggle caption Matt Ludtke/Getty Images

President Obama meets with Jason and Ali McLaughlin and their son, Cooper, while visiting their home in Cedar Rapids, Iowa. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP