Seems like it is (but I really have not know much about that race. Just that the latest polls show he is ahead.)
Obviously, the votes in November will give the final answer, but I recently saw a statement by Sen. McConnel that he is concerned that the Democrats may hold on to the Senate because of concerns about Republican senate candidates.
In my very small opinion, that can be a problem that the Republican primaries are nominating people who are too far to one side and cannot connect with the middle 30-40% of the voters that decide the election.