** Egyptian Opposition: Re-stage 'Flawed' Constitutional Referendum**
Egyptian opposition groups say the first round of a referendum on an Islamist-backed constitution was marred by widespread violations and should be re-staged.
Egypt's main opposition coalition, the National Salvation Front, said Sunday it will not accept any unofficial referendum results. They called for nationwide demonstrations Tuesday before the second round is held next Saturday.
The Muslim Brotherhood, backers of President Mohamed Morsi, claimed victory in Saturday's vote, saying unofficial tallies showed 56 percent approval of the draft constitution.
The Brotherhood said turnout was about one-third of the 26 million people eligible to vote.
The first round of the referendum was held in 10 of Egypt's 27 regions, including the two main cities of Cairo and Alexandria. A second round will be held in Egypt's remaining provinces, most of which are rural and religiously conservative.
Some observers expect the second round to boost the overall "yes" vote for the draft constitution, which requires only a simple majority for passage.
** Obama Joins Mourners in Town Shattered by School Shooting**
U.S. President Barack Obama has vowed to use all his power to make sure that tragedies like Friday's killing of 20 children and six adults at an elementary school are never repeated.
Mr. Obama joined mourners Sunday night in ((the northeastern town of)) Newtown, Connecticut where a gunman's rampage killed the 26 people. He told those gathered for a nighttime vigil for the victims that they are not alone in their grief. The president said people across the country are mourning with them.
Mr. Obama said the nation is left with hard questions after the shooting. He noted this was the fourth mass shooting incident that has occurred since the start of his presidency almost four years ago.
Earlier in the evening, the president met privately with the families of those who lost loved ones at Sandy Hook Elementary School, and to thank the first responders to the tragedy.