I thought it was:
A liberal is a conservative who hasn't been mugged yet?
I realize that he was eventually driven out of the Democratic Party by the socialist hacks that run things over there, but while he was mayor of Philly he definitely exemplified what was best about the Dems.
In contrast, Mayors Goode, Rendell and the thoroughly corrupt John Street have brought nothing but shame and dishonor to the people of that great city.