In this Sept. 2, 2005, file photo, President George Bush tours of a flooded area of New Orleans near the Seventeenth Street levee damaged by Hurricane Katrina. President Barack Obama tweaked his travel plans to head to Louisiana on Monday, Sept. 3, 2012, to see the damage from Hurricane Isaac ahead of his own nominating convention_ shortly after Republican presidential candidate Mitt Romney toured the area. (AP Photo/Susan Walsh, File)
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