Biden lead shrinks, Sanders and Warren close gap: poll

Former Vice President Joe BidenJoe BidenLev Parnas implicates Rick Perry, says Giuliani had him pressure Ukraine to announce Biden probe Ex-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Parnas says he doesn't think that Joe Biden did anything wrong regarding Ukraine MORE still leads the Democratic presidential primary field in a Fox News poll released Wednesday, but Sen. Bernie SandersBernie SandersEx-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Former Vermont Governor: Sanders 'will play dirty' Hill.TV's Krystal Ball rips Warren over feud with Sanders MORE (I-Vt.) and Sen. Elizabeth WarrenElizabeth Ann WarrenEx-Obama official on Sanders-Warren feud: 'I don't think it played out well for either of them' Former Vermont Governor: Sanders 'will play dirty' Hill.TV's Krystal Ball rips Warren over feud with Sanders MORE (D-Mass.) are closing the gap. 

Biden's 29 percent support from Democratic primary voters is down 6 percentage points from his highest poll numbers in May. The former vice president leads all other candidates by 11 points, compared to his 19-point lead in June.

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Sanders earned 18 percent support, the highest he has received in a Fox News poll. Warren dropped 4 percentage points from August to 16 percent support. 

Fifty-six percent of Democratic primary voters said they prioritize a candidate who has the best chance to beat President TrumpDonald John TrumpLev Parnas implicates Rick Perry, says Giuliani had him pressure Ukraine to announce Biden probe Saudi Arabia paid 0 million for cost of US troops in area Parnas claims ex-Trump attorney visited him in jail, asked him to sacrifice himself for president MORE, up 15 percentage points from March. Voters have traditionally seen Biden as the most electable, although the other candidates are closing the gap.

The former vice president and two New England senators are solidifying their status as front-runners in the race. 

Behind them are Sen. Kamala HarrisKamala Devi HarrisOvernight Energy: Schumer votes against USMCA, citing climate impact | Republicans offer details on their environmental proposals | Microsoft aims to be carbon negative by 2030 Here are the 10 senators who voted against Trump's North American trade deal Team Trump criticizes Sanders for vote against USMCA MORE (D-Calif.) at 7 percent, South Bend, Ind., Mayor Pete ButtigiegPeter (Pete) Paul ButtigiegFormer insurance executive: 'Medicare for all' would eliminate jobs that are 'not needed' Buttigieg says he's proud to be a part of US system amid UK royal family drama Buttigieg asked about 'Mayo Pete' memes by New York Times ed board MORE at 5 percent, former Rep. Beto O'RourkeBeto O'RourkeTrump mocks Booker over suspended presidential campaign Julián Castro endorses Warren in 2020 race Klobuchar faces make-or-break Iowa sprint after strong debate MORE (D-Texas) at 4 percent and Sen. Cory BookerCory Anthony BookerNew Hampshire state lawmaker switches support from Warren to Klobuchar Here are the 10 senators who voted against Trump's North American trade deal Team Trump criticizes Sanders for vote against USMCA MORE (D-N.J.) at 3 percent.

Entrepreneur Andrew YangAndrew YangEvelyn Yang shares that she was sexually assaulted by doctor Buttigieg campaign reaches agreement with staff union Panel: Is Andrew Yang playing to win with Dave Chappelle endorsement and Iowa bus tour? MORE and Sen. Amy KlobucharAmy Jean KlobucharSanders says he's concerned about lost campaign time during impeachment trial Sanders touts vote against Trump trade deal backed by primary rivals New Hampshire state lawmaker switches support from Warren to Klobuchar MORE (D-Minn.) follow at 2 percent.

Biden keeps the lead when distinguishing between white and nonwhite voters. But he has a 13 percentage point lead among nonwhite voters, compared to a 7 percentage point lead among white voters, which aligns with previous polls.

The poll was conducted between Sept. 15 and Sept. 17 with 1,008 registered voters. The margin of error is 4.5 percentage points for Democratic primary voters.