Interesting fact about the location. We Are WI was in the same building as the campaign office as Jennifer Shilling (D). She is running against incumbent Sen. Dan Kapanke (R) in a recall election. The two organizations even share a wall.
Now, election laws say that there cannot be any collusion between campaigns and 3-rd party groups. How much does anyone want to bet that wall didn't really stop any cooperation from going on.
As to the cause of the fire? My guess is someone's

got set down on a pile of empty cheeto bags and old pizza boxes and there was not enough water in the bong to the fire out.