I've done '1776' twice. The first time I played Caesar Rodney (far from my first choice of roles since he's off stage for such a long stretch).
The second time I did it I was down to the last two in being considered for John Dickinson which I REALLY wanted. Alas, I missed it and got Judge Wilson instead. He has some wonderful moments in the show, and I enjoyed playing it, but the part isn't as rich as Dickinson, of course.