To make things more interesting, I'll go ahead and try to make predictions on a district basis for Indiana, since I'm familiar with the state. I fully expect to get several of these wrong, given that we generally don't have polling data for individual districts and whatnot, but it'll be fun.
Here's a map of the districts.
Brief descriptions, with
Cook PVI and significant cities.
1st (D+10) Northwest Indiana, including Gary and Michigan City. Largely industrial, influenced mostly by Chicago.
2nd (R+6) Northern Indiana, including South Bend and Elkhart. Notre Dame is in this district.
3rd (R+13) Northeastern Indiana, including Fort Wayne.
The 1st is largely urbanized, while the 2nd and 3rd are more of a mix of urban and rural. All would be largely characterized as "Rust Belt."
4th (R+11) Stretches from western suburbs of Indianapolis to the north and west, including Lafayette and Kokomo. Purdue is in this district.
5th (R+9) Northern (and wealthy) suburbs of Indianapolis including Carmel, Fishers, and Noblesville. Also some of the north side of Indianapolis itself as well as the economically distressed city of Anderson.
6th (R+12) Stretches from eastern suburbs of Indiana to the east and south (and a little northeast), including Muncie, Richmond, and Columbus. Ball State is in this district. Geographically much of this district is in Southern Indiana, but a lot of the population is in the northern part of the district.
7th (D+13) This district covers most of the city of Indianapolis, and that's pretty much all you need to know.
8th (R+8) Western and southwestern Indiana, including Terre Haute and Evansville. Indiana State and the University of Evansville are in this district.
9th (R+9) Stretches from southern suburbs of Indianapolis, including Greenwood, south to suburbs of Louisville. Also includes Bloomington. Indiana University is in this district (referring to it as "the University of Indiana" is almost as bad a faux pas as referring to Hoosiers as "Indianans").
Republicans
Trump sweep. It just seems like Cruz's campaign is collapsing, what with recent polling, the Kasich alliance going over like a lead balloon, and an air of desperation. The 1st, 2nd, and 3rd districts should be particularly strong Trump territory. His protectionism will play well there. Likewise, Trump tends to do well in urban districts like the 7th.
The 6th, 8th, and 9th all cover Southern Indiana, which are dominated more by religious conservatives than the rest of the state. While that would seem to bode well for Cruz, these areas have somewhat Southern characteristics (many of the settlers in this area migrated from Virginia), and Trump tends to do well with religious conservatives in the South. Indeed, Trump did quite well in Southern Ohio and Southern Illinois, both of which share that characteristic with Southern Indiana. Also, to be blunt, this is a part of the state with a particular racism problem.
The 4th and 5th are where I expect Cruz to keep it closest. The northern and western suburbs of Indianapolis remind me a lot of the Milwaukee suburbs, where Cruz cleaned up. Also, Trump often struggles in college counties like the 4th's Tippecanoe. For that same reason, I would expect Cruz to fare better in the 9th than the other two Southern Indiana districts.
Democrats
Hillary takes the 1st, 5th, 6th, 7th, and 8th, as well as statewide. Bernie wins the 2nd, 3rd, 4th, and 9th.
The 1st and 7th should be easy wins for Hillary. Both are largely urban districts with relatively high African American populations. The 5th, 6th, and 8th should all be tighter and depend on whether they vote more like Ohio (where southern and suburban districts favored Hillary) or Illinois (where Bernie fared better in similar districts). Given the overall polling and likelihood of Bernie's supporters being discouraged, I give her the edge here.
The 4th and 9th should give Bernie massive margins in and around the major universities, and I expect that to swamp any advantage Hillary might have elsewhere in the districts. The 2nd and 3rd districts should favor Bernie for the same reason they favor Trump (largely white industrial districts where an anti-trade message will resonate).
I'll be very curious to see the results here. I find it particularly fun to follow elections in states I'm familiar with. Again, I fully expect to get a couple of these wrong, but we'll see.