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 Davis RyanAmash storm hits Capitol Hill Debate with Donald Trump? Just say no Ex-Trump adviser says GOP needs a better health-care message for 2020 MORE (13 percent), Kentucky Sen. Rand PaulRandal (Rand) Howard PaulO'Rourke: Trump 'provoking' war with Iran by sending troops to Middle East Overnight Defense: 1,500 troops heading to Mideast to counter Iran | Trump cites Iran tensions to push through Saudi arms sale | Senate confirms Army, Navy chiefs before weeklong recess Trump to send 1,500 troops to Middle East to counter Iran 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 Diane Rodham Clinton2020 Democrats target federal ban on abortion funding Hillary Clinton slams Trump for spreading 'sexist trash' about Pelosi Gillibrand seizes on abortion debate to jump-start campaign 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 Ann WarrenTrump defense pick expected to face tense confirmation 2020 Democrats target federal ban on abortion funding Gillibrand seizes on abortion debate to jump-start campaign MORE (Mass.). 

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