Attorney General Eric Holder failed to tell the Senate about seven legal briefs he signed when lawmakers considered his nomination to his current job, according to a letter released on Friday.Two of the briefs involved appeals to the Supreme Court for Jose Padilla, who sought release from a military prison in South Carolina where he was being held after then-President George W. Bush designated him an "enemy combatant." Padilla was held in a military brig for three years before his case was moved to a criminal court in Miami, where he was convicted on charges of offering his services to...