Wisconsin's ban on gay marriage has been struck down by a federal judge.

"Because my review of that law convinces me that plaintiffs are entitled to the same treatment as any heterosexual couple, I conclude that the Wisconsin laws banning marriage between same-sex couples are unconstitutional," U.S. District Judge Barbara Crabb wrote in her ruling.

This is the 14th federal ruling against state marriage bans since last June, when the Supreme Court ruled the federal Defense of Marriage Act was unconstitutional.

Below, more from the AP:

MADISON, Wis. (AP) — A federal judge has struck down Wisconsin's ban on same-sex marriage, ruling it unconstitutional.

U.S. District Judge Barbara Crabb issued the ruling Friday, but it wasn't clear whether same-sex marriages could immediately begin.

But the ruling makes Wisconsin the 27th state where same-sex couples can marry under law or where a judge has ruled they ought to be allowed to wed.

Clerks in the state's two largest cities of Milwaukee and Madison had been preparing for such a ruling by bringing in extra staff to handle an expected flood of marriage-license applicants.

The lawsuit was brought by the American Civil Liberties Union on behalf of eight same-sex couples.

Gov. Scott Walker has been a strong proponent of the constitutional same-sex marriage ban that was approved by state voters in 2006.

Read the judge's ruling below: