Constitutional bans on same-sex marriage were approved in 11 states in Tuesday's election.

Approval rates for the amendments were generally very high, with at least 90 percent of precincts reporting as of 5 a.m. Eastern time.

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Arkansas -- 75 percent

Georgia -- 77 percent

Kentucky -- 75 percent

Michigan -- 59 percent

Mississippi -- 86 percent

Montana -- 66 percent

North Dakota -- 73 percent

Ohio -- 62 percent

Oklahoma -- 76 percent

Oregon -- 57 percent

Utah -- 66 percent

Some of the proposals not only define marriage as between a man and a woman, but would bar legislatures from setting up other systems, such as civil unions, that have the same effect as marriage.

Some of the proposals not only define marriage as between a man and a woman, but would bar legislatures from setting up other systems, such as civil unions, that have the same effect as marriage.

In Utah, for instance, the amendment bars unions that have "substantially equal legal effect."

In Georgia, Ohio and Mississippi, gay-rights activists are considering court challenges to the newly approved amendments.

Many states have laws that address the issue, but some worry that those could be overturned as unconstitutionally discriminatory.

Louisiana and Missouri voters approved amendments to their state constitutions earlier this year.

In August, 70 percent of voters in Missouri voted for an amendment that said marriage must be between a man and a woman.

Louisiana voters overwhelmingly approved an amendment in September, but it has since been nullified by a court because it seemed to address both marriage and civil unions. Voters may have to address the issue again in December or sometime in 2005.

The issue of same-sex marriage came to the forefront this year after Massachusetts' top court said the state's constitution does not allow the state to deny marriage licenses to homosexual couples.

In the spring, the state began issuing the licenses, though the state Legislature has approved an amendment to change the process. That amendment must be approved again by legislators and then voters.

Soon after, the mayor of San Francisco began issuing marriage licenses, though he was later found to be in violation of state law. Counties and cities in other part of the country followed suit, leading President George W. Bush to call for an amendment to the U.S. Constitution defining marriage.

The idea of a Federal Marriage Amendment failed in the U.S. Senate, but could come up again sometime.