WASHINGTON - Counterterror officials suspect that an Arab student linked to one of the Sept. 11 hijackers may have cased the presidential ranch in Crawford, Tex. - six months before the 9/11 attacks. Muhammad Al-Gurashi and three other Arab men suspected of close ties to hijacker Hani Hanjour rented a car in Phoenix and drove to Freeport, Tex., in March 2001, intelligence and law enforcement sources say. They are believed to have stopped near President Bush's ranch to assess security for a possible terrorist attack, the sources told the Daily News. Al-Gurashi, a 28-year-old Saudi who attended Arizona State University,...