MARC DANZIGER ON OBAMA’S SLIPPAGE AMONG INDEPENDENTS: “Looking at why Obama seems to be having such a popularity collapse suggests that models of the polity that were bipolar – i.e. D’s and R’s – probably don’t represent reality as models that are tripolar – D’s, R’s, and I’s. And while the I’s may be largely ideologically rooted in one side or the other, their “brand attachment” is weak, meaning that they can be flipped easily or else that they aren’t necessarily going to come out and vote unless they are engaged.”