Wisconsin
Outlook: Lean Democrat
incumbent Democrat Jim Doyle is not very popular in Wisconsin, but probably is not unpopular enough to be defeated. Former GOP Governor Tommy Thompson would probably beat him, but a run from Thompson is not all that likely. Milwaukee County exec Scott Walker and Congressman Mark Green will probably end up battling for the Republican nomination. Neither is very likely to win, but an upset is not out of the question in this very politically divided state.
When even the teachers are starting to desert Doyle you know there's something wrong. He will have a hard time winning. Scott Walker is really popular in my area and he has a somehwhat good chance of winning if he gets the nomination.