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 RyanRepublicans raise red flags about ObamaCare repeal strategy Overnight Healthcare: GOP in talks about helping insurers after ObamaCare repeal Ryan on Trump: 'We're not looking back' MORE (13 percent), Kentucky Sen. Rand PaulRand PaulGOP rep: Trump has 'extra-constitutional' view of presidency The ignored question: What does the future Republican Party look like? Rand Paul skeptical about Romney as secretary of State 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 ClintonDemocrats miss warning signs, even in blue Maryland Robert Gates doesn't expect job in Trump administration Dean drops out of DNC chairmanship race 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 WarrenSanders vs. Trump: The battle of the bully pulpit Trump’s Treasury pick leaves Sears board: report Reeling Dems look for new leader MORE (Mass.). 

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