Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) and former tech entrepreneur Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE have been climbing in the Democratic presidential race, while the three front-runners – former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), and Sen. Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) – have seen a slight dip though they remain ahead, according to a Hill-HarrisX poll released on Wednesday.

The survey, which has a margin of error of plus or minus 4.5 percentage points, shows Harris up three percentage points with 7 percent support among Democratic and independent registered voters.

This marks a boost for Harris, who has been in a slump in recent months. Following her breakout performance during the first Democratic debate in July, Harris surged past Warren to rank third in an identical survey conducted June 29-30, garnering as much as as 11 percent. But the California senator has since struggled to reach the double-digits.

The poll also shows Yang gaining ground on top-tier White House contenders. The former tech entrepreneur ticked up to his highest mark in the survey yet at 5 percent.

Top-tier candidates, including Biden, Sanders and Warren, all saw a slight dip. Biden slipped three percentage points to 27 percent, while Sanders dropped 2 points to 15 percent. Warren, meanwhile, dipped to 12 percent, which marked a 2-point decrease.

HarrisX researchers surveyed 454 registered Democrats and independents voters between September 7 and 8.

The survey comes as 10 Democratic presidential hopefuls prepare to take the stage Thursday night in Houston for the next round of Democratic debates.

Unlike the first two debates the upcoming debate will not be split into two nights, marking the first time all of the candidates will be together on the debate stage.

—Tess Bonn