From Lynn Sweet ...

John McCain campaign manager Rick Davis--under the spotlight because of his work for mortgage giants Fannie Mae and Freddie Mac--is skipping a Wednesday lunch with reporters sponsored by the Christian Science Monitor.

On Tuesday, word came that McCain political director Mike DuHaime will substitute for Davis because he is "heading out on the trail" today.

Davis is the subject of stories in the New York Times and Newsweek about his work for the failed mortgage market makers. At issue right now: did Davis contradict McCain's statement that he has not been involved with Fannie and Freddie for some time.