A number of tribes in North Sinai called Thursday onEgyptians to cast their ballots in favor of presidential candidate Abdel-Fattah el-Sisiin the polls slated for May 26-27.The call was made in a mass conference by members from el-Dawaghra, el-Baiadia,el-Alawia and el-Sawarka tribes.Representatives of 12 tribes and Salafist el-Nour Party along other youth movementsattended the conference.The speakers voiced support to Sisi comparing him to former leader Gamal Abdel-Nasser.