Democrat 2020 Nominee Betting Odds: What Are Biden, Sanders, Beto And Harris' Chances Of Winning?

While he has yet to announce his candidacy, former Vice-President Joe Biden has been given the best early odds of winning the Democratic nomination for the 2020 election.

Biden has 7/2 odds while Sen. Bernie Sanders of Vermont and Sen. Kamala Harris of California both have 4/1 odds of winning the nomination, according to SkyBet.

But it appears to be a four-candidate race, according to oddsmakers, as former Texas Rep. Robert "Beto" O'Rourke barely trails the group with 5/1 odds. O'Rourke raised $6.1 million in his first day, surpassing Sanders, who raised $5.9 million.

Biden's odds would likely improve once he officially announces his bid.

Age might be an interesting factor in determining the nominee. Biden is 76 years old, while Sanders is 77. Hillary Clinton was 69 years old at the time of the 2016 election.

President Trump, the presumed Republican nominee, is 72 years old.

Harris, who is 54 years old, and O'Rourke, who is 46 years old, are considerably younger than Trump and their top Democratic challengers.

After Biden, Sanders, Harris and O'Rourke, the field seems to be made up of longshots, though the Iowa Caucuses are still more than 10 months away.

Perhaps the most intriguing underdog is Andrew Yang. The 44-year-old New York entrepreneur is a relative unknown, though he was recently profiled on the comedy program "The Daily Show" and has generated some interest for his Universal Basic Income plan.

Yang shares 16/1 odds with Sen. Amy Klobuchar of Minnesota. They are ahead of Sen. Cory Booker of New Jersey and Mayor Pete Buttigieg of South Bend, Indiana, who are listed at 20/1. Sen. Elizabeth Warren of Massachusetts, meanwhile, has 22/1 odds.

According to betting site Bovada, Democrats are the -150 favorite to win the 2020 election, while the Republicans are the underdogs at +120.

A recent poll by Economist/YouGov had Trump's approval rating at 42 percent and his disapproval rating at 56 percent.