Just my guess. Yours is as good as mine.
True there is a Chicago-Indy mafia that essentially runs the business and (allied) union interests in Indiana. They’re also big social libs, almost NYC level. Trust me I used to live there (Columbus) HQ of Cummins located there. Two reasons I hate the Auto Industry:
1) Run by huge liberal Democrats (and some “moderate Republicans” at best
2) Unions are still represented in that industry heavily.
and lastly
3) It consists of mostly repetitive work that just doesn’t interest me, both on the engineering side (heavily regulated by a compliant Federal government, and other bureaucrats, btw..) and on the manufacturing side.