Among the most sacrosanct rights of U.S. citizens is the right to vote, and perhaps the best-known principle of voting rights is the expression “one person, one vote.”Wags often cite the exception of Chicago — where alleged voting fraud has reached mythical proportions — but the principle is widely recognized and generally accepted as true.But how true is it, and what does it really mean?In at least one respect, “one person, one vote” is actually not very true at all: How equally votes …