Egyptians have been flocking to polling stations across the country as millions of voters are urged to participate in a constitutional referendum, the first ballot since the military overthrew Islamist President Mohamed Morsi on July 3.br br Voting will resume in the morning for the second and final day - in what many are seeing as a test of populat support for the military-led overthrow of former president Mohamed Morsi.br  br Critics of the constitution say it just boosts the power of the army, taking advantage of a population fed up with constant political upheaval. br  br Al Jazeera's Nicole Johnston reports.