Can't include a link due to under 20 posts but google Nate Cohn's article "There Are More White Voters Than People Think." Its a pretty open and shut case, local voter file data and the CPS survey show that the electorate was probably 74-75% white nationally in 2012 and will be 72-73% white this year.
Which is sort of why I personally have just stuck to the exit polls. They provided a compelling argument but gave 3 sets of numbers and suggested all have their own issues. I suppose the CPS numbers are probably the best bet, but I'm hoping after this election we can get a clearer picture of the electorate with this issue factored in.
