Bernie Sanders' 2020 campaign has made major gains since he had a heart attack in early October.
The Vermont senator has surged in polls in early-voting states as well as at the national level.
According to Business Insider, Bernie has garnered several major endorsements along the way.
The self-declared Democratic socialist could end up being the most underestimated candidate in the race.
Shortly after his heart attack, Sanders was endorsed by three major Democratic stars.