Based on that better quality video, it looks more like an accident on a dark crowded sidewalk rather than a deliberate assault.
I don’t think so. You need to read the account that is linked a few posts above.
From the horse's mouth:
After Coakley finished her answer, she began walking away from the restaurant, and I walked behind her asking why health care industry lobbyists were supporting her at the fundraiser. She didn't reply.
As I walked down the street, a man who appeared to be associated with the Coakley campaign pushed me into a freestanding metal railing. I ended up on the sidewalk. I was fine. He helped me up from the ground, but kept pushing up against me, blocking my path toward Coakley down the street.
He asked if I was with the media, and I told him I work for THE WEEKLY STANDARD. When I asked him who he worked for he replied, "I work for me." He demanded to see my credentials, and even though it was a public street, I showed them to him.
Didn't you watch the rest? The guy continued to push him toward the camera (away from coakley) and then tried to prevent the guy from following her. Looks like the guy was trying to take a picture. He finally escaped.
SEIU bodyguard goon?
Look at the second vid, post #18. Clearly her guy was harassing the guy who “fell” after he got back up. Not an accident at all.