SACRAMENTO — The campaign has yet to begin, but voters appear to support — at first blush — a ballot measure to require parental notification for pregnant minors who seek an abortion.

In a Field Poll released earlier this week, 48 percent supported Proposition 4, and 39 percent opposed it. The poll, which surveyed 672 voters likely to participate in the November election, had a margin of error of plus or minus 5.6 percentage points.

Previous incarnations of parental notification measures were defeated twice in California in 2005 and 2006. Has there been an attitude shift?