Over the past six weeks, a proposed constitutional amendment that would end same-sex marriage in California has gained substantial ground but still trails by a five-point margin heading into Tuesday's election.

A new Field Poll shows Proposition 8, one of the most closely watched state ballot measures in years, is supported by 44 percent of likely voters. Forty-nine percent oppose it, and 7 percent are undecided.

In the last Field Poll, released Sept. 18, the measure was behind by 17 points.

"It's certainly closer than it was before the advertising campaign hit," said Field Poll director Mark DiCamillo. "A lot of that has to do with the campaigning on the Yes (on 8) side."

In television ads, supporters have expanded their arguments beyond the issue of whether gay couples should be allowed to marry to warn that schools would incorporate same-sex marriage into lesson plans.

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