How Important Was The Born Again Vote?

I find the numbers in this item hard to believe--anyone have any good data?

Christians Push Bush Over the Top

Overall, born again Christians supported President George W. Bush by a 62% to 38% margin. In contrast, non-born again voters supported Senator John Kerry by an almost identical 59% to 39% division. The difference was in the rates of turnout of each segment. Although the born again population constitutes just 38% of the national population, it represented 53% of the vote cast in the election. If the born again public had shown up proportional to its population size, Senator Kerry would have won the election by the same three-point margin of victory enjoyed by Mr. Bush.