The top three candidates are far ahead of the rest of the pack in the 2020 Democratic presidential field, according to three national polls released Sunday.

A Washington Post-ABC News poll showed former Vice President Joe Biden at 28 percent among Democrats and Democratic-leaning registered voters, Massachusetts Sen. Elizabeth Warren at 23 percent and Vermont Sen. Bernie Sanders at 17 percent. Those three are the only candidates with double-digit support. (Among all voters, the numbers are Biden at 27 percent, Warren at 21, and Sanders at 19.)

An NBC News-Wall Street Journal poll offered similar results, with Biden at 27 percent, Warren at 23 and Sanders at 19. A Fox News poll had the best news for Biden, showing him at 31 percent, Warren at 21 and Sanders at 19.

The three polls were released exactly one year before Election Day 2020.

Mayor Pete Buttigieg of South Bend, Ind., sits in fourth place in all three polls, with his current support ranging from 6 to 9 percent. Buttigieg, however, has recently shown greater strength in individual states, polling at 20 percent, for instance, in an Iowa poll released Thursday by Iowa State University.

California Sen. Kamala Harris, who was polling in double digits during the summer, was in fifth place in two polls and sixth (behind Minnesota Sen. Amy Klobuchar) in one of them. One bit of good news for her: Harris’ 4 percent showing in the NBC/WSJ poll was sufficient to qualify her for the Democrats’ December debate being sponsored by POLITICO and PBS.

Here are some secondary points gleaned from various other questions asked in these three polls:

— In the Washington Post-ABC poll, Biden was judged to to be the most electable, with 42 percent picking him as the Democrat most likely to defeat President Donald Trump.

— Also in that poll, Sanders was chosen as the candidate most likely to understand “the problems of people like you,” with 30 percent picking him in that category.

— In the NBC/WSJ poll, only 37 percent of Democratic primary voters say they prefer a candidate who will build on former President Barack Obama’s legacy.

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— Also in that poll, 34 percent of the overall respondents said they were certain to vote for Trump in the 2020 election, but 46 percent said they were certain to vote against him.

— More than 50 percent of those polled in the Fox News poll said they thought Biden, Warren and Sanders could beat Trump in 2020, led by Biden at 68 percent. Only 30 percent thought Buttigieg could.

— 49 of those polled in both the Fox News poll and NBC/Wall Street Journal poll want Trump impeached and removed from office.

— Trump’s approval rating in the Fox News poll was 42 percent; it was 45 percent in the NBC/WSJ poll.

All three polls were conducted Oct. 27-30.

