Brief thought exercise: if Vietnam had never happened, would LBJ be considered one of the best Presidents of all-time?

[youtube http://www.youtube.com/watch?v=lafWBlulBJU&w=600&h=315]

That piece above aired on CBS Sunday Morning last week -- it's kind of half a profile of Bryan Cranston, post-Breaking Bad, playing LBJ and kind of half a profile of LBJ himself. At the end (the very end), there's an interesting context where John Lewis (the Georgia politician tied to the c…