Hardly a day seems to pass without leaders of the Religious Right threatening that so-called "values voters" may not turn out to vote unless the Republican nominee is reliably conservative on issues like abortion or gay marriage. "Our voters would rather stay home than vote for half a loaf of bread," says Bill Stephens, the executive director of the Christian Coalition of Florida. "They either want the whole loaf, or they’ll wait for next time." Others, like the Family Research Council’s Tony Perkins, are raising the possibility of a third party candidate. As a result, the Republican candidates are falling...