You need no better proof than Ralph Reed himself:
A national post-election survey commissioned by the Faith and Freedom Coalition last night found that the evangelical vote increased in 2012 to a record 27% of the electorate and that white evangelicals voted roughly 78% for Mitt Romney to 21% for Barack Obama. This was the highest share of the vote in modern political history for evangelicals, Reed said.Republicans cannot use the excuse that their base voters didn't turn out for this election as they did in 2008. White evangelical conservatives did turn out exactly as they said they would over and over again this election cycle. The problem for Republicans is there are not enough of them to win a national election anymore. At least not in the states that count. Detroit isn't bankrupt, but the 'Southern Strategy' is.
“Evangelicals turned out in record numbers and voted as heavily for Mitt Romney yesterday as they did for George W. Bush in 2004,” Reed observed. “That is an astonishing outcome that few would have predicted even a few months ago. But Romney underperformed with younger voters and minorities and that in the end made the difference for Obama.”