Biden, Sanders, Warren support dips in new poll

Top-tier candidates, including former Vice President Joe BidenJoe BidenTrump endorses Ken Paxton over George P. Bush in Texas attorney general race GOP lawmakers request Cuba meeting with Biden For families, sending money home to Cuba shouldn't be a political football MORE and Sen. Bernie SandersBernie SandersGOP sees debt ceiling as its leverage against Biden Democrats brace for slog on Biden's spending plan To break the corporate tax logjam, tax overinflated CEO pay 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 WarrenSenate confirms Biden's Air Force secretary Senate Democrats press administration on human rights abuses in Philippines Will Pence primary Trump — and win? 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 celebrates anniversary of Americans with Disabilities Act Will Pence primary Trump — and win? Kavanaugh conspiracy? Demands to reopen investigation ignore both facts and the law 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 ButtigiegChasten Buttigieg: DC 'almost unaffordable' JD Vance takes aim at culture wars, childless politicians Poll: 73 percent of Democratic voters would consider voting for Biden in the 2024 primary 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 Bullock65 former governors, mayors back bipartisan infrastructure deal Arkansas, New Jersey governors to head National Governors Association Biden 'allies' painting him into a corner MORE (D-Mont.), former San Antonio Mayor Julián Castro (D), and Sen. Amy KlobucharAmy KlobucharBiden signals tough stance on tech with antitrust picks Hillicon Valley: Democrats introduce bill to hold platforms accountable for misinformation during health crises | Website outages hit Olympics, Amazon and major banks Competition laws could be a death knell for startup mergers and acquisitions MORE (D-Minn.) all ticked up one point to two percent. Best-selling author Marianne WilliamsonMarianne WilliamsonMarianne Williamson calls on Biden to drop efforts to extradite Assange Susan Sarandon and Marianne Williamson call for justice in Steven Donziger case Marianne Williamson: Refusal to hike minimum wage is part of 'rigged economy' 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