You'll note that it also takes a swing at the city attorney and personnel director, two others who are not exactly Rosenthal favorites. In fact, it's probably fair to say that he loathes them, or at least that's what he's told many people.
The final 2011 comic, produced after the election, is looking forward to the next election. It makes it clear the author doesn't much like Republican city Councilor Ken Cockayne. Here it is: