Former Florida Gov. Jeb Bush and former Arkansas Gov. Mike Huckabee are leading a pack of Republicans in Iowa for the GOP presidential nomination in 2016, according to a new poll. 

The survey by GOP firm Vox Populi released Tuesday shows 18 percent of active GOP voters in the early caucus state would vote for Bush, narrowly edging out Huckabee with 15 percent. 

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Huckabee and Bush have been near the top of a tight pack of potential GOP candidates for the last few months in Iowa, according to similar polling. 

Four other potential GOP presidential candidates also score double digits: Wisconsin Rep. Paul RyanPaul RyanMeet Trump's secret weapon on infrastructure Here comes Trump-o-nomics GOP waiting to hear from Trump on ObamaCare MORE (13 percent), Kentucky Sen. Rand PaulRand PaulDems blast Trump plans for deep spending cuts Trump team prepares dramatic cuts Paul, Lee call on Trump to work with Congress on foreign policy MORE (12 percent), Florida Sen. Marco Rubio (11 percent), and Rick Santorum (10 percent).

Nine percent said they would vote for Texas Sen. Ted Cruz, while Wisconsin Gov. Scott Walker and New Jersey Gov. Chris Christie are tied at the bottom with 6 percent. 

On the Democratic side, 65 percent said they would vote for Hillary ClintonHillary Rodham ClintonFranken emerges as liberal force in hearings SNL honors Obama with emotional musical tribute Trump: Why didn't protesters vote? MORE, who has dominated early polling and started a tour to promote her new book Tuesday. Eighteen percent would choose Vice President Biden, while 12 percent prefer Sen. Elizabeth WarrenElizabeth WarrenFranken emerges as liberal force in hearings Women's marches draw huge crowds as Trump takes office Warren: 'I'm here to fight back' MORE (Mass.). 

The poll surveyed 667 active voters from June 4-5 and has a margin of error of 3.8 percent.