In Washington, there's dispute about whether the US should provide air cover for Syrian dissidents being mowed down by the Army led by President Bashar al-Assad. Senators John McCain and John Kerry, a Republican and a Democrat, have opposing views. Meanwhile, a video posted on YouTube appears to show a high ranking Syrian official announcing that he has defected and joined what he calls, "the revolution of this dignified people." Liz Sly is based in Beirut, Lebanon for the Washington Post.