Voters are less likely to support presidential candidates who favor gay marriage bans, a new ABC News/Washington Post poll found.

Forty-two percent of respondents said they would be less likely to support a candidate who favors a constitutional amendment banning gay marriage, while 25 percent said they would be more likely to support such a candidate. Only 20 percent said they would be much more likely.

A plurality of Republican-leaning respondents, however, said they supported such candidates.

Thirty-eight percent of Republicans said they would be more likely to support a candidate who favors a constitutional amendment banning gay men and lesbians from marrying, including 29 percent who said they would be much more likely, while 27 percent said they would be less likely to support such a candidate.

Jamison Foser at Equality Matters crunched the numbers to conclude that 47 percent of Democrats and independents would be less likely to support a candidate who favors gay marriage bans, while 21 percent would.

“[A]mong the vast majority of Americans who are not Republican base voters, support for a ban on gay marriage is increasingly toxic,” Foser noted.

And when pollsters asked of Republican-leaning respondents, “What's the single most important issue to you in your choice for the Republican candidate for president?” fifty-one percent answered the economy, while only 3 percent cited social issues (asked as moral/family values).