He encouraged the audience to be calm. He was trying to answer the kid's question, but the kid kept ranting away when he was asked to leave. The students were the ones that called police. Not Kerry. The tasering was over the top, but that is no way Kerry's fault.
He has thrown more crumbs to the liberal base than most of our elected representives. He has lead on issues (i.e. smacking down McCain, Alito, ending the war, holding the crooks accountable, helping Al Gore with his cause, etc.) more than most.
I don't understand why people are so quick to slam one of the few that is on our side.
OTOH, Good luck with finding a "great" and perfect leader the fit your needs.