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Obama and space shuttle Endeavour STS-134 astronauts

U.S. President Barack Obama shakes hands with space shuttle Endeavour mission commander Mark Kelly (R) after the mission was postponed at the Kennedy Space Center at Cape Canaveral, Florida, April 29, 2011. Kelly is the husband of wounded U.S. Rep. Gabrielle Giffords (D-AZ) who is also in Florida to watch the liftoff.
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