I don't know if I've stumbled onto something or not, but in the video report below from WKOW 27, you'll notice on the bumper of one of the cars vandalized with a BB gun, a blue fist sticker. A number of car's windows were shot out around town. Did the vehicles have evidence of the owners political leanings?
I have a call into to the Madison police department and will be checking to see if there is any possible connection to the cars targeted. Maybe it's nothing.