Rep. Dusty Johnson (R-S.D.) is leading the Republican primary for South Dakota governor, according to a new poll. An Emerson College Polling/Nexstar Media survey released on Wednesday showed Johnson in first place with 28 percent, with businessman Toby Doeden with 18 percent, Gov. Larry Rhoden at 17 percent and state Rep. Jon Hansen (R) at 14 percent. A… Ā