Obama advisers have said privately for months that McCain would be their preferred opponent among all those who sought the GOP nomination.
But Sarah H. Duggin, an associate law professor at Catholic University who has studied the "natural born" issue in detail, said the question is "not so simple." While she said McCain would probably prevail in a determined legal challenge to his eligibility to be president, she added that the matter can be fully resolved only by a constitutional amendment or a Supreme Court decision. "The Constitution is ambiguous," Duggin said. "The McCain side has some really good arguments, but ultimately there has never been any real resolution of this issue. Congress cannot legislatively change the meaning of the Constitution."