If Judge Vaughn Walker's decision declaring the California gay marriage law unconstitutional is eventually upheld by the US Supreme Court, it could overturn gay marriage bans in 45 states.
In the federal trial on California's Prop. 8, defenders of the voter ban on gay marriage called their first witnesses Monday. Defense lawyers argue that gays and lesbians in California enjoy plenty of political power and do not need extra constitutional protection.
Legal challenges ensue in federal court, and plans are afoot for a 2010 ballot measure to undo Proposition 8.