By David Gutman Is Sen. Joe Manchin going to run for governor in 2016?For now, only he knows.But if he does, and he wins, Republicans in the West Virginia Senate want to make sure that he doesn't get to choose who serves the remainder of his term in the U.S. Senate.The state Senate passed a bill (SB 548) on Sunday, strictly along party lines, to change how vacant seats in the U.S.