** ADDS RELATIONSHIP TO MARC MEZVINSKY ** FILE - In this Jan. 5, 1993 file photo, then-House Speaker Thomas Foley administers the House oath, during a re-enactment, to Rep Marjorie Margolies-Mezvinsky D-Pa., accompanied by husband Edward, left, and family, on Capitol Hill in Washington. Chelsea Clinton has become engaged to her longtime boyfriend, Marc Mezvinsky. Mezvinsky is a son of Marjorie Margolies-Mezvinsky and former Iowa Rep. Ed Mezvinsky, longtime friends of the Clintons. (AP Photo/Dennis Cook, File)