As of August 2011, there are 41 states that ban [[same-sex marriage]], mostly by Constitution. Minnesota has a state law prohibiting same-sex marriage, but will have a referendum on the ballot in November 2012 to include the ban in the state constitution.
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The nine states plus Washington, D.C., which do not yet ban same-sex marriage are:
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{| class="wikitable"
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!State (or D.C.)
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!History
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!Comments
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|Massachusetts
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|by decision of its Supreme Court
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|subsequently property values declined and many left the state
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|Vermont
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|Iowa
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|by decision of its Supreme Court
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|after imposing same-sex marriage, three justices were subsequently removed from office in their retention election in November 2010