US President Barack Obama tours damage caused by devastating severe storms and tornadoes in the Tuscaloosa, Alabama, area, April 29, 2011. Obama promised federal aid on Friday to the tornado-ravaged US South after he got a close-up look at the "heartbreaking" impact of deadly twisters that killed at least 310 people. [Photo/Agencies]
US President Barack Obama shakes hands with residents while he tours damage caused by devastating severe storms and tornadoes in the Tuscaloosa, Alabama, area, April 29, 2011.[Photo/Agencies]