Four Republican presidential candidates lead Hillary ClintonHillary Diane Rodham ClintonTrump, Biden set for tight battle in Florida We need to be 'One America,' the polling says — and the politicians should listen Poll shows Biden with 6-point edge on Trump in Florida MORE nationally in head-to-head match-ups, according to a new poll.

The Fox News survey released on Tuesday shows Ben CarsonBenjamin (Ben) Solomon CarsonKristol-backed group releases ad showing GOP voters blasting Trump over coronavirus response White House slams pastor leading Cabinet Bible studies for linking homosexuality, coronavirus Conservative group hits Trump for coronavirus response in new ad MORE running the strongest against Clinton, with the retired neurosurgeon taking 50 percent, compared to only 39 percent for the former secretary of State.

Donald TrumpDonald John TrumpCDC updates website to remove dosage guidance on drug touted by Trump Trump says he'd like economy to reopen 'with a big bang' but acknowledges it may be limited Graham backs Trump, vows no money for WHO in next funding bill MORE leads Clinton by 45 percent to 40, Jeb Bush leads Clinton 44 to 40 and Carly Fiorina leads Clinton 42 to 39, the poll found.

While it can be dangerous to read too much into any poll this early in the presidential contest, the Fox News survey wil give ammunition to those arguing that Vice President Biden would be a stronger Democratic candidate than Clinton. 

Biden leads all of those same Republican contenders in head-to-head match-ups. He's up on Trump by 50 percent to 37, Bush by 46 to 41 percent and enjoys leads of 46 to 42 percent over both Carson and Fiorina.

Sen. Marco RubioMarco Antonio RubioPhase-four virus relief hits a wall On The Money: Senate aims to quickly approve more small-business aid | Dems seek conditions on new funds for small-business loans | Pelosi says next round of relief will top T The Hill's Coronavirus Report: Debruyne Says Global Response Platform Needed; Navarro Saw It Coming MORE (R-Fla.) does the best in a head-to-head match-up against Biden, trailing by only one point, 44 to 43 percent.

In previous polls, Clinton held leads over all of those candidates except for Bush, who led 44 to 42 percent over Clinton in an August poll.

The Fox News survey also provides new evidence underlying Carson’s early strength.

Carson raised $20 million in the second quarter, which will likely be the biggest haul of any of the GOP contenders. He routinely attracts thousands of supporters on the campaign trail and is firmly in second place in polls of the Republican presidential nomination, trailing only Trump.

The poll found Clinton maintaining a healthy lead in the race for the Democratic presidential nomination, taking 45 percent support, followed by Sen. Bernie SandersBernie SandersDrugmaker caps insulin costs at to help diabetes patients during pandemic The Hill's Campaign Report: Wisconsin votes despite coronavirus pandemic Sen. Brown endorses Biden for president MORE (I-Vt.) at 25 percent and Biden at 19 percent.

That’s a bigger lead for Clinton than in the same poll from September, when the former secretary of State took 44 percent support, followed by Sanders at 30 and Biden at 18.

Biden has yet to decide whether to enter the race.

The Fox News poll of 1,004 registered voters was conducted between Oct. 10 and Oct. 12 and has a 3-percentage-point margin of error.