Washington governor signs gay marriage bill into law

OLYMPIA, WA - Gov. Chris Gregoire has signed into law a bill that legalizes gay marriage in Washington state, making it the nation's seventh to allow gay and lesbian couples to wed.

It's a historic moment, but same-sex couples can't walk down the aisle just yet.

The law takes effect June 7, but opponents are already mounting challenges on multiple fronts.

Opponents planned to file a challenge Monday that could put the law on hold pending the outcome of a November vote.

Separately, an initiative was filed at the beginning of the session that opponents of gay marriage say could lead to the new law being overturned.

Gregoire signed the bill Monday morning. It passed the House on Wednesday, a week after Senate approval.