You are right. As time passes: police get more nervous and trigger happy, police chiefs get more hesitant and circle the wagons, police protection dwindles, rioters get bolder and more damaging, white/black antagonism increases, and the specter of vigilantism rises, etc.
Obama's goal: National Marshall law prior to cancelling the next election.
Martial Law..
The current designation for such activities in use at most of the staff officer training courses I've attended or of which I'm aware is no longer martial law, but is nowadays referred to as Military Rule.