No WI is more in play than the other three states. Bush lost WI in 2004 by 11,000 votes and in 2000 by 5,700 votes.
Wisconsin has been trending liberal more than the other States listed and Southeast Wisconsin (the most dense population area) is smack-dab in the middle of the Chicago media market. That makes Obama almost a “native son” in Madison.
No, Wisconsin will only flip if McCain is strong enough to flip Minnesota, Michigan and Pennsylvania.
Yes, Wisconsin is in play more than MN. Personally, if I wouldn’t waste time anywhere except for NM, OH, CO, VA, PA, and maybe MI and WI.