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Wow, play a little Devil's Advocate and watch out! Don't worry Mr. Greenwald, even a few of us non-lawyers are always up for a difficult question.
But in terms of the propriety of their religious appeals for votes, is there really any meaningful difference between the two campaigns?
Yes. There is a difference. I looked up "propriety" in the dictionary, and there are four definitions, I am going to assume you are using the "true nature" definition. I think there is a difference in the true nature of their religious appeals.
As an agnostic who favors Obama for president, I have been uncomfortable with his religious statements. However, I am taking them for the statements of a pragmatic politician who really wants to be President. I think he has no choice but to make these statements, especially in South Carolina.
Huckabee is a preacher who has made religion his fundamental reason for existence.
Their appeals are different. However, if you had posed the question "Are the effects of these statement any different?" Well, I couldn't answer that one.
Is it possible to criticize Huckabee for inappropriately exploiting his status in Iowa as a "Christian leader" -- as many, many people did -- while believing that Obama's hailing of himself in South Carolina as a "Committed Christian" is perfectly fine? What's the difference?
It is very possible and has happened numerous times. I don't think what Obama is doing is "perfectly fine" as stated above, but I understand why he is doing it (I hope).