To observe the sentimental fantasy and ruthless political calculation that fuels the Bush administration's immigration plans, one need only turn to Michael Gerson’s most recent Washington Post column. Former Bush speechwriter Gerson was a powerful voice in the White House, especially on the matter of injecting faith into policymaking; his May 25 column provides a window into how the administration deals with facts. Gerson accuses opponents of the Senate’s recent amnesty proposal of a nativist fear of illegal immigrants. Such a fear, he argues, will hurt the Republican party’s electoral chances and miss an opportunity to make the country even...