Republican mayor of San Diego Supports Gay Marriage

Turns his back on campaign promises to oppose gay marriage in an emotional press conference:

It really is poignant; he gets choked up partway through, and you really can see he has wrestled with this personally:

"I have close family members and friends who are a member of the gay and lesbian community. Those folks include my daughter Lisa, as well as members of my personal staff.

"I want for them the same thing that we all want for our loved ones—for each of them to find a mate whom they love deeply and who loves them back; someone with whom they can grow old together and share life’s experiences.

"And I want their relationships to be protected equally under the law. In the end, I couldn’t look any of them in the face and tell them that their relationship—their very lives—were any less meaningful than the marriage I share with my wife Rana.

Edited to add: cakmpls pointed out the site for the office of the mayor, where you can send an email:
http://www.sandiego.gov/mayor/contact/index.shtml