Most Americans believe in the right to keep and bear arms. Even in California, I think. A liberal couple I talked with the other day are anti-gun but were very surprised when I explained that the courts have claimed that there is no right to keep and bear arms in California.
Such people are woefully ignorant of firearms and are easily swayed by emotional appeals. This couple knew of someone who was killed in a violent act by a murderer using a shotgun. They did not choose to sign the petition, but I doubt they would bother to go to the polls to support anti-gun measures.