U.S. President Barack Obama's assistant Reggie Love takes video using his iPad of damage caused by devastating severe storms and tornadoes in the Tuscaloosa, Alabama April 29, 2011. Obama promised federal aid on Friday to the tornado-ravaged U.S. South after he got a close-up look at the "heartbreaking" impact of deadly twisters that killed at least 310 people. REUTERS/Larry Downing (UNITED STATES - Tags: POLITICS DISASTER ENVIRONMENT)