Rick Santorum won the Louisiana Republican presidential primary Saturday, beating front-runner Mitt Romney in the race to challenge President Obama. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP
Rick Santorum trailer screenshot

Rick Santorum told voters in Mandeville, La. on Wednesday that they were "not looking for someone who's the Etch A Sketch candidate." Sean Gardner /Reuters /Landov hide caption

itoggle caption Sean Gardner /Reuters /Landov

Former Pennsylvania Sen. Rick Santorum and his wife, Karen, greet supporters during a rally Saturday in Springfield, Mo. After picking up a decisive win in Kansas, Santorum now turns his attention to Missouri's upcoming caucuses. Whitney Curtis/Getty Images hide caption

itoggle caption Whitney Curtis/Getty Images

Republican presidential candidate Rick Santorum addresses an election night party in Steubenville, Ohio, on Tuesday. Jim Watson/AFP/Getty Images hide caption

itoggle caption Jim Watson/AFP/Getty Images

Then-Sen. John F. Kennedy participates in a question-and-answer session with the Ministers' Association of Greater Houston on Sept. 12, 1960, in Houston. In a speech to the group, Kennedy addressed concerns about his Catholicism and his run for the presidency. Houston Chronicle/AP hide caption

itoggle caption Houston Chronicle/AP

On the campaign trail, Rick Santorum portrays himself as a Washington outsider. But the former senator has made money from inside-the-Beltway pursuits. Jeff Kowalsky/EPA/Landov hide caption

itoggle caption Jeff Kowalsky/EPA/Landov