I personally believe in a power larger than I. Is it God, is it something else, I don't know, and refuse to speculate as that line of reasoning leaves me with only unanswered questions.
Should a political figure declare their faith, of course. It would be found out anyways. Mitt Romney one of the Presidential hopefuls is a Mormon. This fact has cause him to stutter in the polls, where if he were any other Christian faith he would probably have a big lead on the other candidates. What if he wasn't Christian? Well his faith would still need to be declared, and it would probably hurt his chances, since so many people in America make these kinds of useless judgments about a persons leadership abilities.
It should be noted I am not for or against any of the candidates, but with the current line of thinking from republicans, I think it would be best if our country had a vacation from that line of thought.