John F. Kennedy's election in 1960 was supposed to have laid the "religious question" to rest, yet it arises again with a fury. What does the Constitution mean when it says there should be no religion test for office? It plainly means that a candidate can't be barred from running because he or she happens to be a Quaker or a Buddhist or a Pentecostal. But Mitt Romney's candidacy raises a broader issue: Is the substance of private beliefs off-limits? You can ask if a candidate believes in school vouchers and vote for someone else if you disagree with the answer. But can you ask if he believes that the Garden of Eden was located in Jackson County, Mo., as the Mormon founder taught, and vote against him on the grounds of that answer? Or, for that matter, because of the kind of underwear he wears?
Slate editor Jacob Weisberg threw down the challenge after reviewing some of Joseph Smith's more...