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I have never seen a single presidential candidate that visited a scientific convention for example, it doe's not do good for a political business. but they all go to church many times throughout the election period or whenever they need to show sympathy for the crowd, even Obama doe's the same, it's just part of doing business.
My personal take on this is that politicians even though not religious or not even believe in anything, intentionally cater to religious groups of people because they blindly go where they been told to go in the name of whatever idea they come up with without questioning the motive, thus control the masses!!!