While the Vice President of the United States is the first-in-line to the presidency if something happens to the President, most Vice Presidents have failed to gain the presidency after their President’s term(s) had been completed. George H.W. Bush was the first Vice President to be elected President while his President was still in office since Martin Van Buren in 1836. In 2020, Joe Biden was elected, though he wasn’t Vice President for four years.