COLUMBIA, S.C. AP – Rep. Joe Wilson may have shouted his way into the toughest election fight of his life.

Just ask former Sen. George Allen of Virginia, a conservative darling who suffered a surprise defeat in 2006 after calling an Indian-American campaign worker “macaca” – an ethnic slur in some countries. Or Rep. Cynthia McKinney of Georgia, who was tossed out of office the same year after striking a police officer who tried to make her show identification before entering the Capitol complex.