Since leaving office as mayor, Giuliani has remained politically active by campaigning for Republican candidates for political offices at all levels. When George Pataki became Governor in 1995, this represented the first time the positions of both Mayor and Governor were held simultaneously by Republicans since John Lindsay and Nelson Rockefeller. Giuliani and Pataki were instrumental in bringing the 2004 Republican National Convention to New York City. He was a speaker at the convention, and endorsed President George W. Bush for re-election by recalling that immediately after the World Trade Center towers fell,