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Biden, Sanders, Warren support dips in new poll

Top-tier candidates, including former Vice President Joe BidenJoe BidenFear of insider attack prompts additional FBI screening of National Guard troops: AP Iran convicts American businessman on spying charge: report DC, state capitals see few issues, heavy security amid protest worries MORE and Sen. Bernie SandersBernie SandersBiden tax-hike proposals face bumpy road ahead Senate Democrats leery of nixing filibuster 'Almost Heaven, West Virginia' — Joe Manchin and a 50-50 Senate 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 to tap Rohit Chopra to lead CFPB, Gensler for SEC chair: reports Biden tax-hike proposals face bumpy road ahead Porter loses seat on House panel overseeing financial sector 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 HarrisBiden-Harris team unveils inauguration playlist Trump approval rating relatively unchanged in wake of Capitol rioting: NBC News poll Harris to resign from Senate seat on Monday 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 ButtigiegOn The Money: Retail sales drop in latest sign of weakening economy | Fast-food workers strike for minimum wage | US officials raise concerns over Mexico's handling of energy permits Buttigieg confirmation hearing slated for Thursday James Murdoch predicts 'a reckoning' for media after Capitol riot 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 BullockBiden's identity politics do a disservice to his nominees Senate Democrat: Party's message to rural voters is 'really flawed' Ducey to lead Republican governors MORE (D-Mont.), former San Antonio Mayor Julián Castro (D), and Sen. Amy KlobucharAmy KlobucharGoogle completes Fitbit acquisition Hillicon Valley: Fringe social networks boosted after Capitol attack | Planned protests spark fears of violence in Trump's final days | Election security efforts likely to gain ground in Democrat-controlled Congress US Chamber of Commerce to stop supporting some lawmakers following the Capitol riots MORE (D-Minn.) all ticked up one point to two percent. Best-selling author Marianne WilliamsonMarianne WilliamsonMarianne Williamson discusses America's "soulless ethos" Marianne Williamson discusses speaking at People's Party Convention Fewer people watched opening night of Democratic convention compared to 2016 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