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Gay marriage is suddenly popular. A majority of senators now support gay marriage. The president supports gay marriage. A majority of Americans support gay marriage. Voters approved gay marriage in Washington and Maine last November, the first time it's been approved -- not taken away -- at the ballot box. In oral arguments last month, the Supreme Court looked ready to repeal the Defense of Marriage Act.

But what our map GIF shows is that this wave of support for gay rights follows two large anti-gay rights wave, first under President Bill Clinton and then under President George W. Bush.

Dark gray above shows when states banned gay marriage statutorily. Black shows when states extra-banned it by constitutional amendment. Light red shows when a state adopted domestic partnerships or civil unions. Red shows states with gay marriage.

The most recent entry on the map is Delaware, where legislation allowing gay marriage was introduced in the General Assembly on Thursday With Gov. Jack Markell, a Democrat, supporting the bill and Democrats in control of the state legislature, the only thing keeping the First State from being the 10th state to have marriage equality will be if Illinois, Rhode Island, or Minnesota get there first.