That is crap.
Brown campaigned for US Senate while a State Senator..."on the clock."
This is a political faux pas by the rookie Senator. He should be there and his bowing out is indicative of his true nature and ambition. He will not win election again in Massachusetts without support of the sort of people who are going to attend Wednesdays function.
http://michaelgraham.com/
How can he bow out if he never intended to attend the rally in the first place? Sounds to me like he has his priorities in order, much to the dismay of the perfection squad on here.