The city of Memphis wants a Nashville federal judge to order the state to accept photo library cards issued by the city since last month as a valid form of voting identification. The lawsuit filed Tuesday, July 24, was expected. City Attorney Herman Morris wrote a 33-page legal opinion in January making the city’s case that the new library cards were acceptable under the state law requiring photo ID to vote, which the Tennessee Legislature passed in 2011. With Tuesday’s filing, the city is seeking an injunction “ordering the defendants to issue instructions to the Memphis Election Commission to accept such library cards as a means of identification for the purpose of voting in elections.” Without such instructions, the city claims the state is violating the U.S. Constitution, specifically the equal protection clause.