Voters in the swing states of Florida, Ohio and Pennsylvania oppose the international nuclear accord with Iran by margins of more than 2-to-1, according to a new Quinnipiac University Poll.

Florida voters oppose the deal 61 percent to 25 percent, Ohio voters oppose it 58 percent to 24 percent and Pennsylvania voters oppose it 61 percent to 26 percent, according to the poll.

A majority of voters in each of the states said the deal brokered by the Obama administration to limit Iran's nuclear program in exchange for sanctions relief would make the world less safe.

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At least one lawmaker from those states, Pennsylvania Sen. Bob Casey Robert (Bob) Patrick CaseySecond GOP senator to quarantine after exposure to coronavirus GAO report finds brokers offered false info on coverage for pre-existing conditions Catholic group launches .7M campaign against Biden targeting swing-state voters MORE, Jr., is among 13 Democrats still undecided about the accord in The Hill's Whip List. Lawmakers return to Washington in September.

Senate Minority Leader Harry Reid Harry Mason ReidOn The Trail: Battle over Ginsburg replacement threatens to break Senate Democrats fear Russia interference could spoil bid to retake Senate Graham signals support for confirming a Supreme Court nominee this year MORE (D-Nev.) on Sunday became the latest Democrat to endorse President Obama's top foreign policy initiative, further boosting the deal on Capitol Hill.

While many oppose the deal, a majority of Americans nationally also thinks Congress should reject the accord, a CNN/ORC International poll released last week found.

The issue could also play into the 2016 presidential race, with Democratic front-runner Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE backing Obama's proposal while most Republicans have opposed the deal.

The survey of 1,093 Florida voters, 1,096 Ohio voters and 1,085 Pennsylvania voters was conducted Aug. 7-18 via landlines and cellphones with a margin of error of three points.