I can see how Bill Clinton might campaign in the state. He has great affection for his home state and he will want Hillary to carry it. Bill is actually a really popular figure even in Arkansas and make no mistake, he will be out on the campaign trail.
This. I expect Arkansas to be contested by the Clinton campaign and Bill proably wanting to win it. I bet they place money into the state and contest it then reevaluate funds in October. It may be close in the polling but dont underestimate the power of Bill on the ground. In the 08 primaries he flipped many small counties for Hillary in many of the states he campaigned in, Arkansas is full of smaller counties that would need to flip in order for Hillary to take it. They may come up short, but I expect they will at least fight for it.