Former Secretary of State Hillary ClintonHillary Diane Rodham ClintonGrassley blasts Democrats over unwillingness to probe Clinton GOP lawmakers cite new allegations of political bias in FBI Top intel Dem: Trump Jr. refused to answer questions about Trump Tower discussions with father MORE (D) remains the clear front-runner for the Democratic presidential nomination in 2016, while New Jersey Gov. Chris Christie (R) narrowly leads a packed field of GOP contenders, according to a CNN-ORC poll released Monday.

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According to the survey, 65 percent of Democrats or liberal-leaning independents say they would back Clinton for the presidential nomination. Vice President Biden came in a distant second at 10 percent, followed by Sen. Elizabeth WarrenElizabeth Ann WarrenOvernight Regulation: Net neutrality supporters predict tough court battle | Watchdog to investigate EPA chief's meeting with industry group | Ex-Volkswagen exec gets 7 years for emissions cheating Overnight Tech: Net neutrality supporters predict tough court fight | Warren backs bid to block AT&T, Time Warner merger | NC county refuses to pay ransom to hackers Avalanche of Democratic senators say Franken should resign MORE (D-Mass.) at 7 percent, New York Gov. Andrew Cuomo at 6 percent and Maryland Gov. Martin O’Malley at 2 percent.

Biden headlined a high-profile Democratic fundraiser in the early caucus state of Iowa on Sunday, and political watchers are debating whether the vice president would challenge Clinton in the Democratic primary if she were to decide to run.

The Republican field is far more crowded. Christie leads at 17 percent, just edging Rep. Paul RyanPaul Davis RyanMcConnell names Senate GOP tax conferees House Republican: 'I worry about both sides' of the aisle on DACA Overnight Health Care: 3.6M signed up for ObamaCare in first month | Ryan pledges 'entitlement reform' next year | Dems push for more money to fight opioids MORE (R-Wis.) at 16 percent. Ryan was the Republican vice presidential candidate in 2012.

Sen. Rand PaulRandal (Rand) Howard PaulLexington mayor launches bid for Congress Trump-free Kennedy Center Honors avoids politics Meet the Iran hawk who could be Trump's next secretary of State MORE (R-Ky.) came in third at 13 percent, followed by former Florida Gov. Jeb Bush (R) at 10 percent, Sen. Marco RubioMarco Antonio RubioRyan pledges 'entitlement reform' in 2018 Richard Gere welcomes lawmakers' words of support for Tibet Dem lawmaker gives McConnell's tax reform op-ed a failing grade MORE (R-Fla.) at 9 percent, Sen. Ted CruzRafael (Ted) Edward CruzDebbie Wasserman Schultz marks 10 years as breast cancer survivor Foreign agent registration is no magical shield against Russian propaganda Let Trump be Trump and he'll sail through 2020 MORE (R-Texas) at 7 percent and former Sen. Rick Santorum (R-Pa.) at 5 percent. Santorum was the foremost challenger to Mitt Romney for the 2012 Republican presidential nomination.

Clinton and Christie are two of the most popular political figures in the country, and both routinely register strong favorability ratings in public opinion polls. One Quinnipiac University poll from last month showed Clinton edging Christie 46 to 40 in a head-to-head match-up.

None of the potential candidates have publicly committed to a 2016 run. However, Ready for Hillary, a super-PAC pushing the former New York senator to run, is loaded with former Obama campaign activists.

The CNN-ORC poll of 1,022 adults was conducted between Sept. 6 and Sept. 8 and has a 4.5-percentage-point margin of error.