40 Million Evangelicals do not vote.
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Wow! That number sounds high to me. Have you got a source for that number? From what I can ascertain from researching is that there are 133 million Evangelicals in the U.S. but only 69 million of them are voting age adults. So, per your number, that would mean that only 29 million Evangelicals voted in 2012 out of 127 million votes cast. Hard to believe.
I looked it up. 80 million of voting age less than 50% participation.