Let's not forget Indiana is a state where the Dem base is important, and not giving them any reason at all to stay home is a good idea for Donnelly. Tossup -> Tossup.
This is a great point. Indiana is not North Dakota or West Virginia, there's a sizable Dem base in the state (Indianapolis, Gary, and South Bend proper) that Donnelly needs to get high turnout from if he wants to win. Donnelly needs all the crossover support he can get, and he needs to do that to win, but without the base he's pretty much DOA.