Florida's gay marriage ban has been struck down.

A federal judge on Thursday declared Florida's ban on same-sex marriage unconstitutional, joining state judges in four counties who have sided with gay couples wishing to tie the knot.

U.S. District Judge Robert L. Hinkle in Tallahassee ruled that the ban added to Florida's constitution by voters in 2008 violates the 14th Amendment's guarantees of equal protection and due process. Hinkle issued a stay delaying the effect of his order, meaning no marriage licenses will be immediately issued for gay couples.

Hinkle, an appointee of President Bill Clinton, compared bans on gay marriage to the long-abandoned prohibitions on interracial marriage and predicted both would be viewed by history the same way.

"When observers look back 50 years from now, the arguments supporting Florida's ban on same-sex marriage, though just as sincerely held, will again seem an obvious pretext for discrimination," Hinkle wrote in a 33-page ruling. "To paraphrase a civil rights leader from the age when interracial marriage was struck down, the arc of history is long, but it bends toward justice."

Florida Attorney General Pam Bondi has appealed the previous rulings striking down the ban in Broward, Miami-Dade, Monroe and Palm Beach counties. Hinkle's ruling allows time for appeals in the federal case. Bondi has said the Florida cases should await a final ruling on gay marriage by the U.S. Supreme Court.

A number of similar rulings around the country have been put on hold while appeals are pursued.

The latest Florida ruling came in a pair of lawsuits that brought by gay couples seeking to marry in Florida and others who want to force Florida to recognize gay marriages performed legally in other states. Currently, 19 states and the District of Columbia permit same-sex marriage.

The American Civil Liberties Union of Florida, which represented some of the gay couples, said the tide of rulings makes legal same-sex marriage in Florida appear inevitable.

"We're very pleased to see the ban held unconstitutional in such unequivocal terms so that all Florida families will soon finally have the same protections," said ACLU staff attorney Daniel Tilley.

Dawn Kallio, who married her partner in Washington, DC, said the ruling was just one more hurdle.

"And it's promising that the state federal court has ruled in favor of equality," Kallio said. "And I think it's just a matter of time until the Supreme Court clarifies its ruling from last year to include all of the states."

Liberty Counsel, a law group that has defended Florida's gay marriage ban, issued a statement from founder Mat Staver:

"The judiciary, not marriage, is on trial. When judges issue opinions that natural marriage laws are unconstitutional, they lower the respect for the legal system. When people lose confidence in the courts, the courts will lose their influence. This decision has nothing to do with the Constitution. Floridians did not create, but rather affirmed, natural marriage. A judge's opinion cannot deconstruct the natural created order of male and female."