Why do you think that they've been expanding gun control for the last 60 years? See how much it costs to get even a crappy M-60.
with the help of most of the military
I don't know about the military, they might simple not interfere. But going by other countries, the police would wholeheartedly support it. Human nature isn't any different here than it is elsewhere in the world.
I know not all of our people are armed, but many thousands, if not millions, are. Would they take action in the event elections are suspended indefinitely, especially presidential elections? Perhaps not, but they could and should.
with the help of most of the military
When I enters the military I swore to defend the constitution. That would be the justification for military intervention to restore the constitution. Upon reflection, not sure whether they would do it. As for police favoring a dictatorship, are you implying that they would like to be a Gestapo, especially for Obama?.