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. | 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. |