I have always thought the idea of some sort of army coup after a successful Booth Plot, sucessfully killing all 4 targets(Lincoln, Johnson, Seward, and Grant), to be an interesting idea. It wouldn't be too dificult to pull off for an officer of enough clout and support from the army. My question is who would be the most likely candidate for an American Military Dictatorship at this time period? Who, besides Grant could possibly lead such an attempt?