[cnn-photo-caption image= http://i.l.cnn.net/cnn/2008/POLITICS/04/13/forum/art.obama.sun.gi.jpg caption="Will Sen. Obama beat out Sen. Clinton with the faithful?"]
(CNN) - Which Democrat is winning the battle for religious voters? God only knows.
So far this year, Hillary Clinton has maintained an edge among Roman Catholics, many of them the Hispanic and working-class white voters who have been among the most loyal members of her base.
Thanks in large part to that support, many surveys had also given her a slight edge over Barack Obama among white Democratic voters who attended church of any kind regularly.
But in exit polls, the category of regular church-goers - those who attend services at least once a month or more - were more likely to choose Obama. That category in many states was dominated by African-Americans, who have overwhelmingly backed the Illinois senator's candidacy.