Source for that?
It was one of the posts on FR concerning Grayson crashing a Tea Party - Republican meeting at a Perkins (?) here in Florida (within the last week or so).
Here is the thread:
http://www.freerepublic.com/focus/f-news/2490228/posts?q=1&;page=21
It is post #24 in reply to post #15.
Grayson in the mental hospital source:
http://righthandedpitcher.blogspot.com/2009/10/congressman-grayson-briefly-spent-time.html