Six students were hospitalized after falling ill at a YMCA Youth and Government conference in North Carolina.  In all, Wake emergency medical workers evaluated 150 students and adults who reported nausea, vomiting, diarrhea, stomach cramps and headaches after a catered dinner Friday night at the Raleigh Convention Center.  Catering company Centerplate spokesman Bob Pascal said a health department inspection cleared the company for another dinner planned for Saturday night. The source of the outbreak is being investigated.