Warren gains on Sanders, Biden in new national poll

Sen. Elizabeth WarrenElizabeth Ann WarrenBiden says he won't legalize marijuana because it may be a 'gateway drug' Democrats seize on report of FedEx's Elizabeth Warren tax bill to slam Trump's tax plan Warren 'fully committed' to 'Medicare for All' MORE (D-Mass.) is gaining ground on top-tier White House contenders Sen. Bernie SandersBernie SandersBiden says he won't legalize marijuana because it may be a 'gateway drug' Democrats seize on report of FedEx's Bernie Sanders tax bill to slam Trump's tax plan If we want to save earth, we need to change how we eat MORE (I-Vt.) and former Vice President Joe BidenJoe BidenSondland notified Trump officials of investigation push ahead of Ukraine call: report Biden says he won't legalize marijuana because it may be a 'gateway drug' Impeachment hearings don't move needle with Senate GOP MORE, according to a new Hill-HarrisX survey.

The survey released on Tuesday still shows Warren in third place, but she has ticked up four points over the past two weeks to 14 percent support among likely Democratic and independent voters.

Biden, meanwhile, held onto the top spot with 30 percent, but is down 1 percentage point. Sanders placed second at 17 percent and is up 1 point from the Aug. 9-10 poll.

Sen. Kamala HarrisKamala Devi HarrisIf we want to save earth, we need to change how we eat New poll shows four top-tier 2020 candidates in Iowa The Democratic race for president may not sort itself out MORE (D-Calif.) tied with South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegWarren 'fully committed' to 'Medicare for All' New poll shows four top-tier 2020 candidates in Iowa The Democratic race for president may not sort itself out MORE for fourth place, with each receiving 4 percent support. 

Former Rep. Beto O’Rourke (D-Texas) rounded out the top five at 3 percent, a 1 point decrease compared to the previous poll.

Sen. Cory BookerCory Anthony BookerBiden says he won't legalize marijuana because it may be a 'gateway drug' New poll catapults Buttigieg to frontrunner position in Iowa Deval Patrick: a short runway, but potential to get airborne MORE (N.J.), tech entrepreneur Andrew YangAndrew YangNew poll catapults Buttigieg to frontrunner position in Iowa Growing 2020 field underscores Democratic divide Saagar Enjeti: Yang's plan to regulate big tech misses the mark MORE and Montana Gov. Steve BullockSteve BullockDeval Patrick: a short runway, but potential to get airborne Biden, Buttigieg condemn rocket attacks on Israel Press: Another billionaire need not apply MORE (D) were the only other candidates that polled above 1 percent in the poll. 

The latest results come amid signs that Sanders and Warren are cutting into Biden's lead over the Democratic contenders for the White House, though the former vice president remains the front-runner.

The Hill-HarrisX poll surveyed 465 Democratic and independent registered voters between Aug. 23 and Aug. 24 with a margin of error of plus or minus 4.6 percentage points.

—Tess Bonn