Six months after Maryland, Maine and Washington voters endorsed same-sex marriage at the ballot box, two more states have adopted laws allowing gay couples to marry, and a third is poised to join them. On Tuesday, lawmakers in Delaware adopted a same-sex marriage law, and Minnesota's House of Representatives passed a marriage equality measure there today, setting up a final vote in the Senate on Monday. Last week the Rhode Island legislature adopted a similar measure. That three states have moved to legalize gay marriage over the span of less than a month shows how quickly public attitudes toward same-sex unions are changing. Still, more progress may be difficult until more Republicans start to see the issue as one of civil rights, equal protection under the law and individual liberty.