Was Ben Franklin a playa, and Thomas Jefferson a great lover? Was the route to independence from Britain wrought with as much inner political wrangling as any of today’s Congressional machinations? Should our national bird really have been the turkey? 1776, Keegan Theater’s take on one of America’s most clever and underrated musicals, attempts to answer these questions through vividly imagined depictions of our founding fathers, and smart, lyrical songs; you have to love a…