Former Secretary of State Hillary ClintonHillary Rodham ClintonHillary Clinton condemns 'racist abuse' in Portland attack Clinton returns to election night convention hall to talk about her new book Biden jabs at Trump in Cornell commencement speech MORE holds a commanding lead in the Democratic field of potential 2016 contenders, but Republicans are split on their 2016 prospects, according to a new poll.

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Farleigh Dickinson University's Public Mind Poll of registered voters nationwide gives Clinton 63 percent support from self-identified Democrats and those who lean Democratic. Vice President Biden comes in a distant second with 12 percent, while 3 percent support New York Gov. Andrew Cuomo.

The Republican field is significantly tighter. Sen. Marco RubioMarco RubioSenate panel could pass new Russia sanctions this summer McConnell on Trump: 'We could do with a little less drama' Taking the easy layup: Why brain cancer patients depend on it MORE (Fla.) holds a slight lead over former Florida Gov. Jeb Bush, 18 percent to 16 percent. New Jersey Gov. Chris Christie comes in a close third with 14 percent support, and 9 percent of respondents say they prefer former Pennsylvania Sen. Rick Santorum.

Notably absent from the poll is Sen. Rand PaulRand PaulSenate gears up for fight on Trump's 0B Saudi Arabia arms sale Paul: 0B Saudi arms deal ‘a travesty’ Senate feels pressure for summer healthcare vote MORE (R-Ky.), who recently led the field in a New Hampshire poll conducted by a Democratic firm.

Rubio leads among respondents who describe themselves as conservative, but Christie leads with both liberals and centrists. Rubio also leads with voters aged 18-29, a demographic that the GOP has typically had trouble attracting.

A majority of voters believe the country is headed down the wrong track, but that's essentially unchanged since the last national poll by the university in December of 2012. 

Voters are split on President Obama's job performance, with 46 percent approving and 42 percent disapproving, numbers that are largely unchanged since December.

The Public Mind Poll was conducted among 863 registered voters from April 22-28 and has a margin of error of plus or minus 3.4 percentage points.