WATCH: Joe Biden reveals why he didn't run for President 4 years ago

WATCH: Joe Biden reveals why he didn't run for President

Of all the political figures in America, Vice President Joe Biden is one of the most popular.

He is so popular, in fact, that many think if he had run in the Democratic primaries that he would have beaten both Hillary Clinton and Bernie Sanders to the nomination. He would then be facing off against Donald Trump, who polls show is the most unpopular candidate in American history.

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As controversies continue to mount around both Trump and Clinton and the election now just days away, many are asking why Biden didn't run for the highest office in America?

Speaking to CNN's Michael Smerconish in a lengthy interview last night, Biden explained that he thought he could have beaten Hillary Clinton but didn't run for a different reason:

"I thought I could beat Hillary. I thought I could beat anybody that ran. No one should run for president unless they think they can do that," Biden replied. "I didn't run for one simple, overarching reason: My son was dying and he died. That's the total reason. I have great respect for Hillary."

Joe Biden's son Beau died of brain cancer in May of 2015, having battled the illness for over three years.