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Biden, Sanders, Warren support dips in new poll

Top-tier candidates, including former Vice President Joe BidenJoe BidenTrump and advisers considering firing FBI director after election: WaPo Obama to campaign for Biden in Florida Supreme Court reinstates ban on curbside voting in Alabama MORE and Sen. Bernie SandersBernie SandersBiden endorses Texas Democratic House candidate Julie Oliver Ocasio-Cortez rolls out Twitch channel to urge voting Calls grow for Democrats to ramp up spending in Texas 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 endorses Texas Democratic House candidate Julie Oliver Democratic senators unveil bill to ban discrimination in financial services industry Obama endorses Espy in Mississippi Senate race 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 HarrisObama to campaign for Biden in Florida Biden appears on Brené Brown's podcast to discuss 'empathy, unity and courage' The Hill's Campaign Report: Obama to hit the campaign trail l Biden's eye-popping cash advantage l New battleground polls favor Biden 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 ButtigiegLGBTQ voters must show up at the polls, or risk losing progress Buttigieg says it's time to 'turn the page' on Trump administration Sunday shows preview: Coronavirus cases surge in the Midwest; Trump hits campaign trail after COVID-19 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: Barrett punts on climate, oil industry recusals | Ex-EPA official claims retaliation in lawsuit | Dems seek to uphold ruling ousting Pendley Power players play chess match on COVID-19 aid Democrats seek to block appeal of court ruling ousting Pendley, BLM land plans MORE (D-Mont.), former San Antonio Mayor Julián Castro (D), and Sen. Amy KlobucharAmy KlobucharDurbin signals he isn't interested in chairing Judiciary Committee Democrats seem unlikely to move against Feinstein Senate Democrats call for ramped up Capitol coronavirus testing MORE (D-Minn.) all ticked up one point to two percent. Best-selling author Marianne WilliamsonMarianne WilliamsonMarianne Williamson discusses speaking at People's Party Convention Fewer people watched opening night of Democratic convention compared to 2016 Marianne Williamson: Democratic convention 'like binge watching a Marriott commercial' 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