CAIRO - More than 98 percent of voters backed a new Egyptian constitution in a referendum this week, authorities said on Saturday, though the turnout was lower than some officials had indicated, with under 40 percent of the electorate taking part.The vote advances a transition plan that the military-backed government unveiled after deposing Islamist president Mohamed Morsi last July following mass unrest over his rule."Now that God has supported us in legalizing our constitution, we ask for his aid in achieving the remaining two stages of the road map: the presidential and parliamentary elections," said Nabil Salib, head of the Supreme Election Committee.presidential election to be held before parliamentary polls, a change in the transition plan announced by the army in July.Interim President Adly Mansour is expected to announce within days which election will come first.Army chief General Abdel Fattah al-Sisi led the July 3 overthrow of Morsi and is widely seen as the front-runner for the presidency. He is expected to announce his candidacy within a few days.