WASHINGTON — HUD Secretary Alphonso Jackson, his tenure tarnished by allegations of political favoritism and a criminal investigation, announced his resignation Monday amid the wreckage of the national housing crisis. He leaves behind a trail of unanswered questions about whether he tilted the Department of Housing and Urban Development toward Republican contractors and cronies. The move comes at a shaky time for the economy, with soaring mortgage foreclosures imperiling the nation’s credit m

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