Reports have made clear that there were multiple campaign signs permitted that opposed Scott Walker, and only the pro-Walker sign was not permitted.
It's clear also that they reversed and un-fired the lady, because they couldn't justify her initial firing.
There were other employees of this custodial service that had other signs? If you're referring to the teachers that had bumper stickers you have to keep in mind they're not employed by the same service that allegedly fired the custodian. You seem to be treating this like there's only one employer and that's not true.