Worcester Mayor Joseph Petty is apologizing for comments he made about protesters after a City Hall rally this week.  Petty was apparently unaware of an open microphone when he called some protesters morons, stupid and uneducated.  The protesters had moved in from the rally outside to the City Council meeting, and their chanting was disrupting the proceedings.  Petty says he's sorry for the comments, blaming them on a moment of frustration.