Next to the bridge, the flag was at half-staff outside the shack run by the Trustees of Reservations:
I mentioned the oddness of the half-staff flag to one of the wizened volunteers at the bridge, and he said, "It's for Mary Jo, I guess." That seemed about right. What also seems about right is Marc Ambinder's analysis of Kennedy's path to redemption, which he calls a specifically Jewish kind of redemption, redemption through deeds. This is not to say that Kennedy was right about everything, not by a long shot, but that he spent the 40 years after the incident on Chappaquiddick trying to save his soul, and did so quite effectively.
This article available online at:
http://www.theatlantic.com/international/archive/2009/08/the-view-from-chappaquiddick/24008/
