WRONGIt will hurt him come November. No gay marriage issue that ever went to ballot passed.
Arizona Proposition 107 was a proposed same-sex marriage ban, put before voters by ballot initiative in the 2006 General Election. If passed, it would have prohibited the state of Arizona from recognizing same-sex marriages or civil unions. The state currently has a statute defining marriage as union between a man and a woman. It also prevents recognition of same-sex marriages performed elsewhere.
This proposed amendment to the Arizona Constitution got 48.2% of the vote with 51.8% voting against, making Arizona the first U.S. state to vote down a state marriage amendment.