​Former Vice President Joe Biden and Sen. Elizabeth Warren are in a statistical dead heat in a national poll of 2020 Democratic presidential candidates, with ​Sen. Bernie Sanders coming in third, according to a poll released Wednesday.

​Asked if the Democratic presidential primary were being held today, 21 percent of voters picked Biden as their candidate, 20 percent selected Warren and 16 percent chose ​Sanders, The Economist/YouGov poll shows.

California Sen. Kamala Harris finished fourth with 8 percent.

The poll has a plus/minus margin of error of 2.6 percentage points.

Following Harris were former Texas Rep. Beto O’Rourke and Mayor Pete Buttigieg tied with 5 percent, Sen. Cory Booker and Rep. Tulsi Gabbard even at 2 percent and the remainder hitting 1 percent or less.

Biden’s support is strongest among blacks (38 percent) and among voters age 65 and older (27 percent) and women (25 percent).

Warren’s main backers are white voters (25 percent), people 18 to 29 (22 percent) and males (20 percent).

Nineteen percent of female voters opt for Warren as well.

Sanders’ highest level of support comes from the 18-29 age group with 23 percent.

The poll was conducted between Aug. 10 and 13 and surveyed 1,500 people.