While many vice presidents have become president, the vast majority of them ascended to the position rather than winning it in their own right. In fact, in the past two centuries, only two vice presidents have been elected to the top job upon completion of their bosses’ terms: George H.W. Bush and Martin Van Buren.

By contrast, over just the past 70 years, the losers include Al Gore, Dan Quayle, Walter Mondale, Hubert Humphrey, Henry Wallace and Richard Nixon (who lost in 1960 before winning eight years later).

Even among vice presidents who have ascended to the top job, about half wound up losing their next campaign when they ran for a full term.