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 RyanPaul Ryan: ‘Beautiful day’ to catch up with Bono Healthcare spending: the elephant in the tax reform room Overnight Healthcare: Latest on Senate healthcare bill | Four conservatives say they'll oppose | Obama slams bill | Health groups offer scathing criticism MORE (13 percent), Kentucky Sen. Rand PaulRand PaulOvernight Cybersecurity: Trump tweetstorm on Russia probe | White House reportedly pushing to weaken sanctions bill | Podesta to testify before House Intel Rocky rollout for Senate healthcare bill Overnight Healthcare: Latest on Senate healthcare bill | Four conservatives say they'll oppose | Obama slams bill | Health groups offer scathing criticism 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 ClintonTrump: 'Bothersome' how close Mueller is to Comey House intel panel will interview John Podesta next week: report Overnight Cybersecurity: Trump tweetstorm on Russia probe | White House reportedly pushing to weaken sanctions bill | Podesta to testify before House Intel 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 WarrenLive coverage: Senate GOP unveils its ObamaCare repeal bill Overnight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief Budowsky: Dems madder than hell MORE (Mass.). 

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