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With New York Mayor Michael Bloomberg now condemning as "un-American" those who believe the ground zero mosque should be moved elsewhere, the ill-advised project's most prominent defender is tottering on the precipice of the deep end. It is unfortunate that a man who made a fortune building a media company devoted to providing accurate and timely business information now resorts to such extreme rhetoric. The mayor needs to get a grip and apologize to those he has insulted, who include, according to multiple opinion surveys, clear majorities of New Yorkers and the American people.