A judge in Arkansas ruled Thursday that all gay marriages in the state could go forward, overturning a state Supreme Court ruling Wednesday that had halted the practice. The Arkansas decision Thursday came just 24 hours after a federal judge blocked the enforcement of Idaho's same-sex marriage ban. Eighteen states plus the District of Columbia now allow gay people to marry; those states account for roughly half of the nation's total population.

Here's a map built by The Post's terrific Emily Chow detailing where gay marriage is legal, where it's been challenged and where it's still banned. Click any state for more details on the status of the gay marriage debate in it.