If Mitt Romney defeats President Obama in his bid for reelection on Tuesday, it will mark the success of one of the most deeply cynical political campaigns in American history. It is hard to beat an incumbent no matter the economic climate.

In the 2000 presidential election, Al Gore got more votes than George W. Bush, but still lost the election. The Supreme Court's ruling in Florida gave Bush that pivotal state, and doomed Gore to lose the Electoral College. That odd scenario - where the candidate with the most votes loses - has happened three times in U.S. history.

In the last 100 years only Presidents George H.W. Bush, Jimmy Carter and Gerald Ford lost their bids for reelection. President Lyndon Johnson did not run for a second term.

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