President Obama meets with actor George Clooney, U.S. Special Envoy for Sudan Princeton N. Lyman, and human rights activist John Prendergast (far left) at the White House on March 15. Pete Souza/White House hide caption

itoggle caption Pete Souza/White House

An image from the Republican National Committee's Facebook page advertises its new "Social Victory Center" app. RNC via Facebook.com hide caption

itoggle caption RNC via Facebook.com