It concerns his actions against the residents of Washington, D.C.:
"There are several notable elements in this imbroglio. First, anyone who believes that Dr. Harris might change his mind because of a potential economic threat to his district doesn’t know Dr. Harris, a man not given to self-doubt or the concerns of others. This is someone who actively fights against efforts by the EPA to reduce pollution flowing into the Chesapeake Bay and to forestall the effects of climate change and rising sea levels, either of which would be far more ruinous to his waterfront district than a mere summer boycott.
More remarkable is that Dr. Harris, a reliable Club For Growth and tea party acolyte who so often preaches against an overbearing federal government, is so proud to have thwarted the will of District residents. The decriminalization measure has the support of 80 percent of the populace, according to a recent poll." - Jim