There is nothing exceptionally special about Midwestern casinos, though the Harrah's outside of Chicago has a big pot-limit Omaha game that runs Mondays and Tuesdays ($10-25 blinds).
Canterbury Park Racetrack and Card Club (Minnesota)
1100 Canterbury Road
Shakopee MN 55379
They have Limit games as high as $30-60 at times. The best place to find some poker action in Minnesota.
Harrah's East Chicago
777 Harrah's Blvd
East Chicago, IN 46312
1-877-496-1777 or 1-800-HARRAHS
This place is located outside of Chicago. They have low-limit Stud games and Hold'em games from $5-10 to $20-40. The games can be tough during the weekdays but are not as tough during the weekends. Harrah's also features a high-stakes Pot-Limit Omaha game (with blinds of $10-$25) on Mondays/Tuesdays of each week.
Hollywood Casino (Outside Chicago)
1 New York Street
Aurora, IL 60506
They offer some basic Limit Hold'em and Stud games. Most of the Chicago action is at Trump or Harrah's, but they have some decent games going.
One Buffington Harbor
Gary, Indiana 46406
A slightly nicer poker room than Harrah's, they offer the same mid- to low-limit Hold'em and Stud games. Instead of offering a high-stakes Pot-Limit Omaha game, they offer a No-Limit Hold'em game on Wednesday and Friday