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Cory Booker

U.S. Sen. Cory Booker, the 49-year-old former longtime mayor of Newark, N.J., wants to become America’s next commander-in-chief. The six-year senator from New Jersey has said he’s a “big believer” in Medicare for all and he’s also advocated for prison reform. The politician introduced a bill in 2017 that called to eliminate “environmental injustice” by strengthening legal protections for minorities facing environmental and public health threats. Booker has also pushed legislation that would legalize marijuana and expunge prior pot convictions. In 2016, then-candidate Donald Trump said the Democrats “have no future” if Booker is the future of the party. Photo from The Associated Press.

PHOTOS: Who's running for U.S. president in 2020?

The 2020 U.S. presidential election is nearly two years away, but that’s not stopping Democratic hopefuls from joining the race.

Americans will head to the polls on Nov. 3, 2020, in a race that could see U.S. President Donald Trump push for a second term in office. The Democrats have responded with a diverse list of candidates that is only expected to grow in the coming months.

Right off the bat, there are several names that should be mentioned as potential candidates but have not yet announced their intentions. One is former U.S. vice-president Joe Biden, who has not ruled out a 2020 run at his current age of 76. Bernie Sanders, a 77-year-old U.S. senator from Vermont, is another name that’s out there, but no decision has been made public yet. There’s also Beto O’Rourke, a 46-year-old Texan who nearly defeated U.S. Sen. Ted Cruz in a hotly-contested midterm race that ended just a few months ago.

These three politicians haven’t thrown their hats in the ring yet, and there’s still time to do so. However, there are already some big names who have entered the race.

Some consider U.S. Sen. Kamala Harris of California to be the early front-runner in what is expected to be a crowded field. U.S. Sen. Cory Booker of New Jersey may have more name recognition than other Democrats in the field after being a political target of Trump. From Massachusetts, U.S. Sen. Elizabeth Warren is another name that should be familiar with Americans, especially after Trump mockingly referred to her as “Pocahontas” on a number of occasions after she claimed to be of Native American ancestry.

The rest of the list includes U.S. Sen. Amy Klobuchar of Minnesota, U.S. Sen. Kirsten Gillibrand of New York (exploratory committee), former U.S. secretary of housing and urban development Julian Castro, U.S. Rep. Tulsi Gabbard of Hawaii, former U.S. congressman John Delaney of Virginia, South Bend, Ind., Mayor Pete Buttigieg and New York Times best-selling author Marianne Williamson.

This photo gallery will be updated as more candidates enter the race.