Gov. Mitt Romney knows he must make the speech of his life from the presidential campaign pulpit to set American voters at ease with his Mormonism, just as John F. Kennedy did in 1960 to help them accept his Catholicism. Romney said he knows he has to give a speech along the lines of the famous address in which Kennedy told Houston Protestant ministers: “I do not speak for my church on public matters, and the church does not speak for me.” Romney said he would insist his loyalty as president would be to the American people, not the Mormon...