Former Secretary of State Hillary ClintonHillary Rodham ClintonThe true story of the Benghazi committee Trump posts video slamming Clinton's email server Overnight Regulation: Warren demands stronger worker protections 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.
The Republican field is significantly tighter. Sen. Marco RubioMarco RubioGOP Senate super-PAC reserves M in airtime Reid: Rubio should be sued over missed votes Grayson rips Murphy for voting to create Benghazi panel 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 PaulTrump flexes new digital muscle Republicans question Trump's trip to Scotland Hate TV customer service? So does your senator 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.