Why do people keep on posting this crap. There are millions of votes to be recorded yet. CA has only reported 69% of the vote, WA 55%, etc. Obama is going to receive around 65 million and Romney will go over 60 million.
The excerpt makes your critique look cogent, but deeper in the article the author does a back-of-the-envelope estimate of the still uncounted west coast vote and still comes up with lots of white voters staying home, then does an analysis specific to Ohio and finds the same phenomenon.
Because there are a lot of folks who don't understand the most basic use of statistics, even the basic use and misuse of simple percentages. California would explain a significant chunk of the 'missing' votes.
We'll still have a dropoff from 2008 when all the votes are in, but smaller than those currently being discussed.