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 RyanIf Democrats want to take back the White House start now GOP grapples with how to handle town halls Leaked ObamaCare bill would defund Planned Parenthood MORE (13 percent), Kentucky Sen. Rand PaulRand PaulConquering Trump returns to conservative summit Rand Paul rejects label of 'Trump's most loyal stooge' GOP healthcare plans push health savings account expansion 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 ClintonPerez to hit the Sunday shows following election victory Five takeaways from CPAC Clinton: Dems will be 'strong, unified' with Perez 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 WarrenBrazile: DNC staffers got death threats after email hack Sanders and Schumer are right: Ellison for DNC chair Dean: Schumer's endorsement 'kiss of death' for Ellison MORE (Mass.). 

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