Well, it's not perfectly ward by ward, but the Dane County Clerk's Office has election results
broken down for all of Dane County. Though some results have several wards lumped together, the numbers at least make the suggestion that Mitt Romney didn't win a single ward in all of Dane County. (Click "votes by precinct" under the summary table)
Why is that significant? Well, for one I think it sticks a knife in the notion that rich people vote for Republicans and poor people vote for Democrats. When you're driving through Fitchburg, Maple Bluff or some of the ritzy developments on the far west side, keep in mind that those people voted for Obama too.
Suck it, Waukesha.