I don't know where the idea that Indiana would vote like Wisconsin came from. They are not similar states.
Wishful thinking. All the states bordering IN went firmly Trump, except for Ohio, which went Kasich because he's their governor.
...they didn't. Excluding KY, which is a caucus, Ohio voted 36%
trump, Michigan voted 36%
trump, and Illinois voted 38%
trump. The results in those three states were meaningfully the same in the popular vote (there was a large difference in delegate results due to the different distributions of anti-
trumps and different rules in all three states). There's no reason to think
trump will do more than a few points better than that, and it was difficult to see that being enough to overcome Cruz even before Kasich stopped campaigning here.
Indiana is done. If
trump is serious about winning this, he can do a few tours in the proportional states and then get to work on California tomorrow -- he still has a shot there.