Robert Gibbs will depart his position as press secretary in the Obama White House, where Politico argues that he left an indelible stamp by being true to himself. Who exactly is Robert Gibbs?  Actually, we still don’t know, but as Don Rumsfeld would appreciate, we have a lot fewer unknown unknowns than we did two years ago.  Here’s a replay of Gibbs’ greatest hits, or greatest misses, depending on your perspective: