Minnesota Senate Majority Leader Amy Koch resigned from her leadership post the day after fellow Republicans confronted her about allegations that she had an "inappropriate relationship" with a staff member. "We're here today with a lot of humility and some sadness and even shock," interim Senate Majority Leader Geoff Michel said Friday at a hastily called Capitol news conference. Koch, the state's first female majority leader, was widely considered a hard-working and savvy campaigner who helped Republicans win control of the Senate last year for the first time in four decades. Her sudden resignation stunned Republicans, ending one of the...