I love the pronunciation... HAM-mock, HAV-ock, wisCONsin, (any others I'd missed?) and the Yoopers with their inherant Swedish lilt.
"He's the Super Polock"
"Super? How?"
"His name's Skibinski- He's got a Ski at both ends!"
...sorry if you found that offensive... I am not prejudiced, just crass.

Funny, I always pick up on native oregonians with midwestern parents/grandparents, too... not the accent but the speech pattern. A little slower, and sometimes they say '...yah?" to confirm something, or ask "Can I come with?" missing the last pronoun. Interesting stuff.