Was he really disturbing the peace? Sounds more like he was offending the cop. People yell in their own house all the time (you should hear some of the stuff that goes on at my house

). Loud music. Parties. People don't arrested for yelling at their own house, unless there is some kind of domestic violence going on, etc.
Maybe you should ask the cop. From what the available police reports state he was warned on TWO occasions to calm down. He followed the police officer out of the house and continued to yell and make a public scene. In Massachusetts that's illegal.
How do we know the charges were dropped for political reasons? Did Obama make a phone call? Or did they simply realize they arrested a high mucky muck and that he never should have been arrested in the first place? (I believe the latter.)
It's all in the papers and online news websites. This guy is a well know liberal who just happens to be friends with the mayer AND Obama. Go ahead and draw your own conclusions. You're going to anyways.
In the meantime while the major news outlets are covering this race-baiting asshole the country is going to shit. This country has bigger fish to fry than to deal with some asshat with an ego who got pissed with police officers were called to investigate a suspected break in.
That knob better hope he has a good security system because I think if anyone ever does try to break into that house the police will take their sweet ass time showing up.