The American Civil Liberties Union plans to file suit challenging Missouri’s treatment of same sex marriage. News conferences announcing litigation are planned for today in Kansas City, St. Louis, Jefferson City and Springfield. It’s unclear if the ACLU suit will challenge Missouri’s constitutional ban on same sex marriage or if it would simply seek recognition of gay marriages from other states. In 2004 Missouri became the first state to enact a constitutional amendment prohibiting same sex marriage after the Massachusetts Supreme Court permitted gay marriage there. The Missouri measure was approved with 70 percent of the vote.