Because Wisconsin does not have their primaries until next month, I have yet to see any polls for my district. The 8th is currently held by Steve Kagan, but for years (prior to 2006) is was a Republican leaning seat. There are something like 8 people competing to run for the GOP.
There is a press release today from the Reid Ribble campaign that says that a poll has come out that gives him a 10 point lead (if he wins the nomination) over Kagan. So if that is credible I think that the WI 8th district will be back in GOP hands.