MINNEAPOLIS (AP) - People looking for clues about how soon the Supreme Court will weigh in on state bans of gay marriage should pay close attention to the Court of Appeals for four Rust Belt states.

Justice Ruth Bader Ginsburg told a Minnesota audience Tuesday that there will be "some urgency" if there is an appellate decision to uphold same-sex marriage bans. It would run contrary to a legal trend favoring gay marriage.

Ginsburg says if the appeals panel covering Kentucky, Michigan, Ohio and Tennessee falls in line with other rulings there is "no need for us to rush."

She says the top court will reach a decision point "sooner or later" while commenting on how much societal attitudes regarding same-sex marriage have changed.

Ginsburg spoke at the University of Minnesota Law School.