NEW YORK -- John F. Kennedy's grandson Jack Schlossberg is running for the U.S. House next year, announcing Tuesday that he's seeking a key New York seat set to be vacated by longtime Democratic Rep. Jerry Nadler . “This district should have a representative who can harness the creativity, energy and drive of this district and translate that into political power in Washington,” Schlossberg said in a campaign video posted on social media late Tuesday. In an email to supporters, Schlossberg, a Democrat, said that his campaign will officially launch on Wednesday. Schlossberg has drummed up a large following on social media with frequent posts weighing in on national issues, including taking aim at his cousin, Health Secretary Robert F. Kennedy Jr. Last month, he posted on Instagram an image o

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