Gingrich explains his immigration policy

Many Republicans who fear Mitt Romney is not a true conservative point to his flip-flopping on social issues. Jan Crawford reports on Romney's uphill battle to prove his conservatism to GOP voters.

In front of a conservative Tea Party crowd in Tucson, Ariz., GOP presidential contender Rick Santorum outlined his views on social issues. Dean Reynolds speaks with Santorum to clarify some of the Senator's hard line conservative principles.

In Afghanistan, violent protests continue to rage over the burning of Islam's holy book, the Koran, at a NATO base. David Martin reports on the Afghan outrage and NATO's scramble to minimize damage to the war effort.

CBS News correspondent Clarissa Ward has made her way into Syria twice in recent weeks reporting on the rebels. Scott Pelley speaks with her about recent developments in the country and what it's like reporting independently without the permission of the government.

Up until now, the Obama Administration has firmly rejected calls to arm the Syrian opposition. But, as Norah O'Donnell reports, White House spokesman Jay Carney has opened the door to the possibility.

Veteran war correspondent Marie Colvin - an American - and award-winning French photo-journalist Remi Ochlik were killed in the Syrian government's bombardment of the city of Homs. Scott Pelley reports.