After strong finishes in Iowa and New Hampshire, Sen. Bernie Sanders, I-Vt., holds a double-digit lead over other Democratic presidential contenders in a new national poll.

According to The Washington Post-ABC poll, 32% of Democratic voters say they would vote for Sanders, a 9-percentage-point gain from January's poll.

Former Vice President Joe Biden, who previously led in the poll, saw his support halved from 32% to 16%, putting him in second place.

Former New York City Mayor Mike Bloomberg surged from 8% to 14%, and Massachusetts Sen. Elizabeth Warren's support remains constant at 12%.

Former South Bend, Indiana, Mayor Pete Buttigieg polls at 8%; Sen. Amy Klobuchar, D-Minn., at 7%; businessman Tom Steyer at 2%; and Rep. Tulsi Gabbard, D-Hawaii, at 1%.

Bernie Sanders:'Medicare for All' could slow momentum in Nevada

Biden, Sanders, Warren, Bloomberg, Buttigieg and Klobuchar all beat Trump in head-to-head matchups in the poll.

Sanders' strong showing mirrors the results of two other major national polls released Tuesday that show him in the lead.

Nevada Democratic debate: Who made the stage, how to watch and what to expect

According to polling analytics site FiveThirtyEight's average of presidential primary polls, Sanders remains atop the Democratic field, followed by Biden and Bloomberg.

Candidates will debate Wednesday in Las Vegas before Saturday's caucuses, and the debate stage will include Bloomberg for the very first time, along with Biden, Buttigieg, Klobuchar, Sanders and Warren.

The poll was conducted from Feb. 14-17 of 408 Democratic and Democratic-leaning voters, and it has a margin of error of plus or minus 6 percentage points. The overall results have a sample of 1,066 adults and a sampling error of plus or minus 3.5 percentage points.

The poll says 43% of respondents approve of President Donald Trump, and 53% say they disapprove.

Asked how Trump's behavior changed after impeachment, 61% say it has "not changed," 26% say it "changed for the worse," and 9% say it "changed for the better."