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Not that he's a coward! But imagine what might happen if he attempted to follow Roosevelt's example, or Truman's, when *already* the Right is screaming violent rhetoric about "Socialism", threatening armed uprisings, assassination, and a Military take-over of the country.
Its not surprising he wants to hold on to the Unitary Executive power left him, like a delicious alluring poison, by Bush & Cheney. Public figures, backed by major corporations, are threatening Civil War. A radio personality of dubious intelligence or morals challenges the President of the USA to a "debate". Millions believe he is the AntiChrist.
I'd tread very carefully if I was in his shoes.