The Washington state Senate has passed a bill to legalize same-sex marriage, bringing the state a step closer to becoming the seventh to allow lesbian and gay couples to wed. But the threat of a ballot challenge looms. The packed public galleries burst into applause as the Senate passed the measure on a 28-21 vote Wednesday night after nearly an hour and a half of debate. Four Republicans crossed party lines and voted with majority Democrats for the measure. Three Democrats voted against it.

Read the full story from CBS.