Tonight, the president comes out hard against same-sex marriage, and emotions are rising as the debate heats us. With us tonight, San Francisco mayor Gavin Newsom. He brought this issue center stage earlier this month when he ordered the city and county to issue same-sex marriage licenses; nationally syndicated Christian broadcaster Pastor John MacArthur of California's Grace Community Church; Chad Allen, the actor and producer who starred in TV hits like "My Two Dads" and "Dr. Quinn Medicine Woman," became an activist after he was outed by tabloids in 1996; and Representative Marilyn Musgrave, Republican of Colorado. The White House says the president approves of the broad principles in the federal marriage amendment. That's an amendment she introduced in the House.