It has been somewhat amazing to see how some of the most embattled members of Congress have overcome their liabilities. Rep. Mark Sanford (R-S.C.) overcame a very, very public affair to win election to the House in 2013. Rep. Vance McAllister (R-La.) was caught kissing an aide, dropped out of his reelection bid, changed his mind, and still leads by six points (according to one poll, anyway).