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Four same-sex couples filed suit Wednesday to overturn Montana's ban on gay marriage. As a result, there are now only two states — North Dakota and South Dakota — that still ban gay marriage but are not facing legal challenges that would nix those laws. That number could soon drop to one, too, as a same-sex couple in South Dakota is planning to file suit shortly.
Though the cases around the nation will take some time to work their way through the courts, there is a solid chance they will come out in favor of same-sex advocates. Since the Supreme Court overturned the Defense of Marriage Act last year, 13 courts in a row have ruled in support of gay marriage.