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A headstone sits in a flooded cemetery on August 31, 2012 in Slidell, Louisiana. Louisiana residents are coping with the aftermath of Hurricane Isaac with ongoing flooding, destroyed property and many still without electricity. (Photo by Mario Tama/Getty Images)

Isaac's aftermath

Tens of thousands of customers remained in the dark on Sept. 3 in Louisiana and Mississippi, nearly a week after Isaac inundated the Gulf Coast with a deluge that still has some low-lying areas under water.