An imam under fire for saying that "the greatest terrorists in the world occupy the White House" made a surprising admission yesterday - he campaigned for President Bush in the last election. Imam Umar Abdul-Jalil (right, yesterday), who was suspended Thursday as head chaplain of the city's jails for that and other inflammatory remarks, made the disclosure at a news conference held to defend him. A supporter, the Rev. Lonnie McLeod of the Church of High Hope in East Harlem, said that Abdul-Jalil was "as true an American as you would ever find" and would "lay his life down for...