YIKES. Seems Pitt’s pet cause — a deeply important one — is in trouble, according to SFGate.com (scroll down to second item):

A poll sponsored by CBS 5-TV indicates that California voters now favor passage of Proposition 8, the constitutional amendment to ban same sex “I do’s,” by 47 to 42 percent.

The poll of 670 registered voters taken by Survey USA is a big shift from one taken just last month by the Public Policy Institute of California. That one showed Prop. 8 losing, 55 to 41 percent.

Advocates of same-sex marriage over at the No on 8 campaign say their tracking polls show the same trend, with the ban now leading, 47 to 43 percent. The Yes on 8 campaign happily reports that it’s seeing a shift as well.

One explanation? Well, the latest poll was taken a few days after Prop. 8 proponents put commercials on the air featuring Newsom celebrating the state Supreme Court’s ruling legalizing same-sex marriage by half-yelling, half-growling to a City Hall crowd, “This door’s wide open now! It’s gonna happen – whether you like it or not!”

The same ads show a law professor warning that if the measure passes, it could jeopardize the tax-exempt status of churches and lead to “gay marriage taught in public schools.”

Same-sex marriage proponents dispute both arguments — but the ad does seem to be working.

Learn more — and take action — here. There’s even a wedding registry!