NEW YORK (AP) — 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.