The Quinnipiac poll also tested voters' attitudes about religion and presidential candidates. In a possible red flag for Romney, voters are less comfortable with a Mormon president than having a leader of any other faith, save for Islam. Just 35 percent of voters are "entirely comfortable" with a Mormon president, compared to 60 percent who say the same of a Roman Catholic leader, 55 percent of a Jewish chief executive and 43 percent of an evangelical Christian. Only 24 percent of voters say they are "entirely comfortable" with an atheist president.
Overall, 45 percent of voters have a favorable impression of the Mormon faith, while 32 percent have an unfavorable opinion. Nearly half of voters -- 44 percent -- say Mormonism is "very different" from their own religion.
Yet Romney remains the best-positioned Republican to win the Republican nomination, and the most likely to defeat Obama in November 2012, according to the poll.
The poll was conducted May 31-June 6. Quinnipiac surveyed 1,946 registered voters, for a margin of error of +/- 2.2 percent. Results of the Republican primary ballot test are among 830 registered Republicans and Republican-leaning independents, for a margin of error of +/- 3.4 percent.