the term is relatively new. it refers to the current state of (political) affairs in the united states (but probably doesn't preclude the emerging political model in many european countries...). it basically refers to the ever-widening ideological gap that exists between the voters and those receiving the votes. a political model that underscores a voter's influence. this term was coined by gore vidal.
that ours is a post democracy can be evidenced by last month's poor voter turnout.