Rudolph Giuliani has repeatedly extended the hand of friendship to Christian conservatives in recent months. But a leading member of a think tank closely associated with the former Mayor has just delivered a powerful jab to the face of the same constituency. Mr. Giuliani, long viewed with suspicion by the religious right because of his pro-choice, pro-civil-union positions, went so far as to campaign for former Christian Coalition leader Ralph Reed back in May. The move was widely seen as an attempt to curry favor with a voting bloc that will play a crucial role in electing the Republican Presidential...