The Associated Press has picked up the incident in San Francisco's City Hall in which gay and lesbian couples shouted down anti-marriage protesters with "The Star Spangled Banner".
I believe we have dKos member PaulDem to thank for this.
About 25 anti-gay protesters later blocked the door of the county clerk's office, lying down in front of the line and singing religious songs. Gays and lesbians responded by belting out "The Star-Spangled Banner" until sheriff's deputies escorted the protesters out. No arrests were made.
http://www.mercurynews.com/mld/mercurynews/news/7993553.htm