By Robert Alexander and David B. Cohen
CNN
June 28, 2020
(CNN)The selection of a running mate is among the biggest decisions a presidential candidate will make during their candidacy. The decision is particularly weighty when one realizes that one in five US presidents have not completed their full terms.
At 77 years old, if former Vice President Joe Biden, the presumptive Democratic presidential nominee, wins the 2020 presidential election, he would be the oldest person ever elected president, surpassing President Donald Trump who set that mark in 2016 at age 70. And Biden has not committed to running for a second term if he were to win in November.