Former Republican presidential nominee Mitt RomneyWillard (Mitt) Mitt RomneySenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE leads all potential 2016 GOP candidates among Iowa voters and is nearly three times as popular as his closest rival, a new poll finds.

The former Massachusetts governor and 2012 nominee has the support of 35 percent of likely voters in the early caucus state, with former Gov. Mike Huckabee (Ark.) at 9 percent and Gov. Chris Christie (N.J.) at 6 percent, according to a USA Today/Suffolk University poll released Wednesday. 

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The poll comes a day after Romney told conservative radio show host Hugh Hewitt that, while he is pushing for another Republican besides himself to run in 2016, "circumstances can change."

Before that interview, Romney had repeatedly said that he would not run for president again.

When Romney was kept out of the mix, Huckabee led the GOP field with 13 percent, followed by Christie at 11 percent, Texas Gov. Rick PerryRick PerryEnergy secretary questions consensus that humans cause climate change OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project MORE at 9 percent and former Florida Gov. Jeb Bush at 7 percent.

Among Democrats, former Secretary of State Hillary Clinton had 66 percent support, trailed by Massachusetts Sen. Elizabeth Warren at 10 percent and Vice President Biden with 8 percent.

The presidential polling was conducted Aug. 23-26 and carried a 7-point margin of error.