Obama Visits Louisiana Beach

President Obama visited a beach on the coast of Louisiana today to see the damage first-hand. "These are the tar balls that everyone's been talking about,'' said the president, who will address the media after a formal briefing. "Obviously, until we can stop the flow (of oil from the well) we've got problems.'' BP says we won't know until some time over the weekend whether the "top kill" is working. (More Gulf oil spill stories.)