Big Picture: Oil reaches Louisiana shores

Over one month after the initial explosion and sinking of the Deepwater Horizon oil rig, crude oil continues to flow into the Gulf of Mexico, and oil slicks have slowly reached as far as 12 miles into Louisiana's marshes. According to Louisiana Governor Bobby Jindal, more than 65 miles of Louisiana's shoreline has now been oiled. BP said it will be at least Wednesday before they will try using heavy mud and cement to plug the leak, a maneuver called a "top kill" that represents their best hope of stopping the oil after several failed attempts. Based on low estimates, at least 6 million gallons of crude have spewed into the Gulf so far - though some scientists have said they believe the spill already surpasses the 11 million-gallon 1989 Exxon Valdez oil spill off Alaska as the worst in U.S. history. (39 photos total)

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