San Diego Mayor Jerry Sanders stars in a new ad calling on Republicans to support gay marriage.

In 2007, Sanders held an emotional press conference in which he tearfully reversed his opposition to marriage equality, telling reporters, “I have close family members and friends who are members of the gay and lesbian community. Those folks include my daughter Lisa.”

In the 30-second ad released Friday, Sanders says he came out for marriage equality for two reasons: family and freedom.

“As a Republican I believe in conservative values like responsibility and limited government,” Sanders says in the spot. “Our party is changing on this issue thanks to leaders like Dick and Lynne Cheney, Laura Bush, Ted Olson and Cindy McCain.”

“Marriage strengthens families and we need more of that in this country, not less,” he adds. (The video is embedded on this page. Visit our video library for more videos.)

The ad, produced by gay rights groups Freedom to Marry and the Human Rights Campaign (HRC), comes just days after Republicans meeting in Tampa approved language opposing such unions in the 2012 Republican Platform, which is expected to be ratified at the party's convention next week.

Sanders is a member of the Freedom to Marry group Mayors for the Freedom to Marry.