Four sentences in a letter to Speaker of the House Todd Richardson are about to turn the Missouri political world upside down. “My name is Cora Faith Walker. I will be in the Capitol in January as the Representative of the 74th District. Earlier this week, I reported a sexual assault to the St. Louis Metropolitan Police Department. I named my rapist as Steven Roberts, Jr., who hopes to be in the Capitol in January as the Representative of the 77th District.” On Friday night, Walker, 31, a Ferguson attorney who won the Democratic primary for her seat in August,...