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They were pretty sure based on demographics -- based on education, on social class -- they knew what areas to hit. The question will be for Sanders, on primary night, if it's a close battle, can he do the same thing, and will he know where his votes are coming from? one out of four Democratic primary voters has actually made up their mind, and so the question is, how do you start to try and anchor some of that enthusiasm and make sure to cement that?