[[If an elected official cannot be true in such small things as marriage vows or their oath of office, why should I trust them at all? "If they do such things in the green wood, what will happen in the dry? -
Rapaire]]

First, why assume that it's easier to remain sexually faithful to a spouse than to uphold the Constitution, avoid perjury and other criminal behavior, and be honest about your political values and agenda?   It could be argued that in today's western world, with its permissive attitudes about sex and the many temptations both men and women are exposed to in their daily lives, being true to one's marriage vows may be among the hardest standards to live up to.

But as I've said earlier, the research on people's codes of honor and their honesty/dishonesty, etc., does not back up your assumption that marital fidelity/infidelity in any way predicts how honest/dishonest one will be in business, sports, or even other everyday interpersonal relationships.   (And maybe that's partly because of the strong biological urges that affect things like marital fidelity more than they affect, say, the tendency to cheat on your income tax.)