Mitt Romney's big win in Florida earned him Secret Service protection, but Gingrich, Santorum and Paul aren't conceding anything yet. As the campaign gets nastier, we'll look at the prospects for a divided Republican Party. Also, President Obama announces a new housing plan, and decoding the words people are thinking by analyzing their brain waves.
Banner image: (L-R) Republican presidential candidate Mitt Romney and wife Ann look to their grandson, who holds his ears due to the noise during his Florida primary night party January 31, 2012 in Tampa, Florida. Photo by Joe Raedle/Getty Images; Republican presidential candidate Newt Gingrich speaks as his wife Callista looks on during his Florida primary night party January 31, 2012 in Orlando, Florida. Photo by Chip Somodevilla/Getty Images