Sioux Falls, S.D. -- The waiting room at the Planned Parenthood clinic was packed by the time the doctor arrived -- an hour late because of weather delays in Minneapolis. It was clinic day, the one day a week when the only clinic in South Dakota that provides abortions could take in patients. This time it was a Wednesday. The week before it was a Monday. The day changes depending on the schedules of four doctors from Minnesota who fly to Sioux Falls on a rotating basis to perform abortions, something no doctor in South Dakota will do. The last...