About half of likely Republican primary and caucus voters in key early states of New Hampshire, Iowa and South Carolina says that opposition to same-sex marriage is unacceptable in a candidate, according to a new NBC News/Marist College poll.

Fifty-two percent of those likely to vote in New Hampshire and South Carolina said opposing same-sex marriage is either “mostly” or totally” unacceptable. Forty-seven percent of those likely to vote in Iowa said the same.
In fact, according to the poll, voters said a candidate’s opposition to same-sex marriage is the most unacceptable position among seven they were questioned about.
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The Washington Post reports that, by comparison, 63 percent of Iowa voters say belief in man-made climate change (and fighting it) is unacceptable, 56 percent of New Hampshire voters say raising taxes on the wealthy is a non-starter, and 52 percent of South Carolina voters say support for comprehensive immigration reform that includes a path to citizenship is a deal-breaker on one level or another.
A Pew poll conducted in March 2014 showed 39 percent of Republicans and Republican leaners supported supported marriage.