Upbeat roundtable by Meet the Press, featuring comedian/author Bill Cosby, Congresswoman Maxine Watters, Adrian Fenty (Mayor of Washington D.C.) and Alvin F. Poussaint.  Cosby and Poussaint have co-authored a book entitled Come On, People: on the Path from Victims to Victors (2007).   The main theme of this roundtable is what…