Former U.S. Rep. Patrick Kennedy, D-R.I., left, and actor Martin Sheen, right, greet one another before the screening of the film "Halfway Home," in Boston, Tuesday, May 24, 2011. The screening of the... more 
Former U.S. Rep. Patrick Kennedy, D-R.I., left, and actor Martin Sheen, right, greet one another before the screening of the film "Halfway Home," in Boston, Tuesday, May 24, 2011. The screening of the film is part of a conference on neuroscience and brain research and the treatment of brain disorders co-chaired by Patrick Kennedy. less 
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Associated Press | Photo By Steven Senne
Tue, May 24, 2011 8:36 PM EDT