Me, based on what I know of them and their public life, I would say their expressions may be suspect of being nothing more than to please the potential voters at the event...
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It seems to me the only thing you've learned is that Caesar is a "salad dressing dude."
Let them worship how, where, or what they may. A sense of reliance on God by a president is a good thing, even if it doesn't seem totally sincere, once in office, it would probably be very sincere. I would have more of an issue if they said, "I'm pious so vote for me".