Biden, Sanders, Warren support dips in new poll

Top-tier candidates, including former Vice President Joe BidenJoe BidenBiden leads Sanders by single digits in South Carolina: poll Pro-Trump super PAC hits Biden with new Spanish-language ad in Nevada Biden will go after Bloomberg, Sanders at Las Vegas debate, aides say MORE and Sen. Bernie SandersBernie SandersBiden leads Sanders by single digits in South Carolina: poll Pro-Trump super PAC hits Biden with new Spanish-language ad in Nevada Biden will go after Bloomberg, Sanders at Las Vegas debate, aides say MORE, saw a dip in support over the past two weeks while several lower-tier candidates saw a slight uptick in their numbers, according to the latest Hill-HarrisX poll released on Wednesday.

The survey showed that 31 percent of likely Democratic primary voters back Biden, marking a 3 point drop from an identical poll conducted two weeks ago.

It also found a drop in support for Sanders and Sen. Elizabeth WarrenElizabeth Ann WarrenBiden leads Sanders by single digits in South Carolina: poll 2020 Democratic candidates support Las Vegas casino workers on debate day Sanders takes lead in new Hill/HarrisX poll MORE (D-Mass.), the only other two candidates in double figures in the poll.

Sanders’s support dipped 4 points to 16 percent, while Warren’s support dropped 2 points to 10 percent.

Sen. Kamala HarrisKamala Devi HarrisDemocratic senators ask DOJ watchdog to expand Giuliani probe CNN signs Andrew Yang as contributor How the media fall in and out of love with candidates MORE (D-Calif.) retained her spot in fourth place but her 7 percent support is a decrease of 2 points since the July 29 poll. South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegBiden leads Sanders by single digits in South Carolina: poll 2020 Democratic candidates support Las Vegas casino workers on debate day What to watch in the debate tonight MORE rounded out the top five with 4 percent, a 1 point dip over the past two weeks.

Former Texas congressman Beto O’Rourke, meanwhile, held onto to sixth place with 4 percent support, which is unchanged from two weeks ago.

The number of undecided voters ticked back up to 10 percent, after briefly dropping to 8 percent.

A handful of lower-tier candidates received a slight boost. 

Gov. Steve BullockSteve BullockStates, cities rethink tax incentives after Amazon HQ2 backlash Democrats redefine center as theirs collapses Democratic governors worried about drawn-out 2020 fight MORE (D-Mont.), former San Antonio Mayor Julián Castro (D), and Sen. Amy KlobucharAmy Jean Klobuchar2020 Democratic candidates support Las Vegas casino workers on debate day Democratic senators ask DOJ watchdog to expand Giuliani probe What to watch in the debate tonight MORE (D-Minn.) all ticked up one point to two percent. Best-selling author Marianne WilliamsonMarianne WilliamsonDemocrats: The road to kumbaya The Hill's 12:30 Report: Trump, Pelosi take the gloves off; DNC wants Iowa recanvass Iowa and New Hampshire haters should think twice MORE, who had a breakout moment during the second round of Democratic debates, saw a two-point jump to 2 percent. 

The latest poll comes as a number of 2020 White House contenders make the rounds in Iowa to make their case to caucus goers.

Though the Iowa caucuses are still six months away, virtually every candidate has made an appearance at the Iowa State Fair, which is considered an essential campaign stop for presidential hopefuls on both sides of the aisle.

Many of the candidates are also scrambling to qualify for the next round of Democratic primary debates in September.

The Hill-HarrisX poll was conducted among 451 Democratic and Democratic-leaning independent voters with a margin of error of plus or minus 4.6 percentage points.

—Tess Bonn