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Biden, Sanders, Warren support dips in new poll

Top-tier candidates, including former Vice President Joe BidenJoe BidenCaitlyn Jenner on Hannity touts Trump: 'He was a disruptor' Argentina launches 'Green Mondays' campaign to cut greenhouse gases On The Money: Federal judge vacates CDC's eviction moratorium | Biden says he's open to compromise on corporate tax rate | Treasury unsure of how long it can stave off default without debt limit hike MORE and Sen. Bernie SandersBernie SandersBriahna Joy Gray: Biden campaign promises will struggle if Republicans win back Congress Biden backs COVID-19 vaccine patent waivers McConnell sidesteps Cheney-Trump drama 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 WarrenBiden backs COVID-19 vaccine patent waivers Schumer works to balance a divided caucus's demands DNC gathers opposition research on over 20 potential GOP presidential candidates 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 HarrisCaitlyn Jenner on Hannity touts Trump: 'He was a disruptor' Nearly half of women say they're more stressed amid pandemic: survey Alabama museum unveils restored Greyhound bus for Freedom Rides' 60th anniversary 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 ButtigiegPete ButtigiegBiden administration in talks with LA Mayor Eric Garcetti for India ambassador post: reports Business groups target moderate Democrats on Biden tax plans Biden plugs infrastructure with a personal favorite: Amtrak 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 BullockOvernight Energy: Climate Summit Day 2 — Biden says US will work with other countries on climate innovation Biden announces picks to lead oceans, lands agencies Biden set to pick conservation advocate for top land management role MORE (D-Mont.), former San Antonio Mayor Julián Castro (D), and Sen. Amy KlobucharAmy KlobucharRepublicans float support for antitrust reform after Trump Facebook ban upheld Washington keeps close eye as Apple antitrust fight goes to court Senate Democrats push Biden over raising refugee cap MORE (D-Minn.) all ticked up one point to two percent. Best-selling author Marianne WilliamsonMarianne WilliamsonMarianne Williamson: Refusal to hike minimum wage is part of 'rigged economy' Rush Limbaugh dead at 70 Marianne Williamson discusses America's "soulless ethos" 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