White men are the Democratic Party's best chance to defeat President Trump in the 2020 presidential election, according to the results of a wide-ranging survey released Tuesday.

Former Vice President Joe Biden and Sen. Bernie Sanders, I-Vt., both septuagenarians, are the Democrats' best hope, Public Policy Polling found.

Biden, 74, has the greatest advantage over Trump by 18 percent (56 to 38 percent), followed by Sanders, 76, with a 15 percent advantage (53 to 38 percent). Sanders is an independent, but he ran a competitive campaign for the Democratic nomination in 2016.

PPP found Sen. Cory Booker, the first black U.S. senator from New Jersey, has an 11 percent advantage over Trump (49 to 38 percent).

Trailing Booker are Sens. Elizabeth Warren, D-Mass., and Kirsten Gillibrand, D-N.Y, who are white and each lead Trump by 10 percent (50 to 40 percent, and 48 to 38 percent respectively).

And finally, PPP notes that Sen. Kamala Harris, D-Calif., and Rep. Frederica Wilson, D-Fla., both female lawmakers of color, draw up the rear as 2020 contenders against Trump. They both do have a lead over Trump, but Harris, who has been talked about as a 2020 favorite, only leads by 6 percent (45 to 39 percent); Wilson, who has clashed recently with the Trump administration about Trump's recent call with a Gold Star widow, has a 3-percent advantage (42 to 39 percent).

"While the support level for the possible Democrats fluctuates likely based on name recognition, Trump polls consistently in the 38-40% range no matter who he’s pitted against," PPP wrote in its analysis. "It’s also interesting that the hierarchy of Democratic performance goes white men -> black man -> white women -> women of color."

The national poll, conducted from Oct. 27 to Oct. 29, also showed nearly 50 percent of respondents support impeaching Trump, an all-time high.

The poll surveyed 582 registered voters and has a margin of error of 4.1 percent.