This is interesting: Support for Calif. gay marriage ban slipping
The interesting part is that the original description of the measure relied on the proposed text of the constitutional amendment: "Only marriage between a man and a woman is valid or recognized in California." But since the Cali Supreme Court has already overturned legislative bans, the state attorney general decreed that the description must be changed to indicate that an existing right would be taken away. This seems to make a difference in how people react to the measure:
Among the 70 percent of likely voters who already were familiar with Proposition 8, the modification appeared to make little difference. Among those who knew about the amendment, 56 percent said they opposed it when they heard the original wording and 53 percent opposed it they were given Brown's revised version.
But among the 30 percent of those surveyed who were not previously aware of the measure, the ballot language appeared to matter. Within that subgroup, 42 percent of the respondents said they were inclined to vote 'no' with the original summary, a share that climbed to 58 percent under the new wording.
Which suggests that voters are suspicious of change, no matter what the buzzword in the Presidential campaign might be.