Sanders hits highest support since August

Sen. Bernie SandersBernie SandersGOP is consumed by Trump conspiracy theories Manchin on collision course with Warren, Sanders Sanders on Cheney drama: GOP is an 'anti-democratic cult' MORE’s (I-Vt.) support has climbed to its highest level in nearly five months, according to a new Hill-HarrisX poll of the Democratic presidential primary race.

The nationwide survey released Tuesday showed that 19 percent of respondents support Sanders, which makes him just one point shy of his previous high of 20 percent in the August 16 poll.

Former Vice President Joe BidenJoe BidenDefense lawyers for alleged Capitol rioters to get tours of U.S. Capitol Sasse to introduce legislation giving new hires signing bonuses after negative jobs report Three questions about Biden's conservation goals MORE, meanwhile, maintained the top spot with 29 percent support. Sen. Elizabeth WarrenElizabeth WarrenFree Speech Inc.: The Democratic Party finds a new but shaky faith in corporate free speech Debate over ICBMs: Will 'defund our defenses' be next? Manchin on collision course with Warren, Sanders MORE (D-Mass.) placed third, holding at 11 percent.

After rising to third place alongside Warren in the Jan. 3 survey, former New York City Mayor Michael BloombergMichael BloombergFour years is not enough — Congress should make the child tax credit permanent Biden's spending plans: Good PR, but bad politics and policy Top 12 political donors accounted for almost 1 of every 13 dollars raised since 2009: study MORE slipped 4 percentage points to 7 percent.

Former South Bend, Ind. Mayor Pete ButtigiegPete Buttigieg'Funky Academic:' Public has been 'groomed to measure progress by firsts' Biden administration in talks with LA Mayor Eric Garcetti for India ambassador post: reports Business groups target moderate Democrats on Biden tax plans MORE also saw a slight dip, dropping from 6 percent to 4 percent.

Sen. Amy KlobucharAmy KlobucharStrengthen CBP regulations to reduce opioid deaths Why isn't Washington defending American companies from foreign assaults? Republicans float support for antitrust reform after Trump Facebook ban upheld MORE (D-Minn.) and billionaire Tom SteyerTom SteyerTop 12 political donors accounted for almost 1 of every 13 dollars raised since 2009: study California Democrats weigh their recall options Why we should be leery of companies entering political fray MORE each received three percent support. The rest of the candidates in the crowded Democratic field polled at 2 percent or less.

The survey is likely welcome news for the Sanders campaign ahead of the Iowa caucuses.

Sanders’s campaign has intensified attacks against top rivals ahead in recent months, specifically targeting Biden and Warren.

Sanders and his aides have repeatedly gone after Biden for his past positions on racial issues and his vote in favor of the Iraq War.

Jeff Weaver, a senior adviser to the Sanders campaign, issued a statement over the weekend, saying he found it “appalling” that the former vice president “still refuses to admit he was dead wrong on the Iraq War.”

Former Secretary of State John KerryJohn KerryChina emitted more greenhouse gasses than US, developed world combined in 2019: analysis Overnight Energy: Republicans request documents on Kerry's security clearance process| EPA official directs agency to ramp up enforcement in overburdened communities | Meet Flint prosecutor Kym Worthy Republicans request documents on Kerry's security clearance process MORE later accused Sanders of "distorting" Biden's record on Iraq.

Sanders’s campaign has also engaged in a dust-up with the Massachusetts senator's campaign, reportedly telling prospective voters that the candidate is a weak election choice because she only appeals to white educated liberals.

The back-and-forth eventually culminated with Warren’s claim that Sanders had told her during a 2018 meeting that a woman could not win a general election race against President TrumpDonald TrumpThe Memo: The Obamas unbound, on race Iran says onus is on US to rejoin nuclear deal on third anniversary of withdrawal Assaults on Roe v Wade increasing MORE.

Both feuds could come to a head in Tuesday night’s Democratic primary debate. 

Sanders is among the six candidates set to take the stage in Iowa. The event marks the last debate before the Hawkeye State holds its caucus on Feb. 3.

The Hill-HarrisX survey was conducted among 451 Democratic voters and Democratic-leaning independents. It has a margin of error of plus or minus 4.5 percentage points.

—Tess Bonn