Overall, the poll finds 59 percent support an agreement in which the United States and its negotiating partners lift major economic sanctions in exchange for restrictions on Iran’s nuclear program. Thirty-one percent oppose a deal.

Support outpaces opposition across nearly all demographic and political groups, with liberals (seven in 10) and Democrats (two-thirds) the most supportive. At least six in 10 independents and moderates also back the broad idea of a deal with Iran.

Republicans are about evenly divided on an Iran deal, with 47 percent in support and 43 percent opposed. The split contrasts with Republican lawmakers’ widespread backing of Israeli Prime Minister Benjamin Netanyahu’s speech deriding the potential deal in early March before a joint meeting of lawmakers. Additionally, all but seven Republican senators signed a letter to Iran’s leadership warning that Congress or a future president could override any agreement made by the Obama administration.

Popular sentiment among Republicans is more in line with GOP lawmakers on the issue of whether Congress should be required to authorize any deal with Iran.