I just returned for Rep. Cohen's healthcare town-hall.  The wingers were out in force and making much noise but there was no violence and Rep. Cohen handled them admirably.  He just kept saying the truth and letting people speak regardless of their take on the issue.  He asked question that he asked us to answer by standing like, 'Wo has Medicare?' and 'How many of you want to end Medicare?'  
The one time that he did show irritation was when at the beginning of the meeting while he was trying to introduce his staff to those of us who live in the district would know who to contact for what constituent services and the out of district protesters were shouting him down about healthcare before we got to that topic.

The crowd was close to evenly split and the shouters won no friends.  The made themselves look particularly ridiculous.  They tried to shout down even speakers who were on their side.  One particularly loud young man who was behind me shouting and complaining about 'socialism' called for the age for medicare to be lowered to 21 so that we could keep the government out of healthcare ;-).  There was also a lot of screaming about euthanasia, illegal aliens and abortion.