America has had 50 vice presidents, 15 of whom went on to become president. Only four of them were elected president while still serving as veep, however: John Adams (1796), Thomas Jefferson (1800), Martin Van Buren (1836), and George H.W. Bush (1988). Several other sitting vice presidents have run for the highest office in the land but were unsuccessful, including Richard Nixon in 1960, Hubert Humphrey in 1968, and Al Gore in 2000. So while the vice presidency stands as perhaps the single be...
