JoAnna Gaut, protests the President's Obama's visit Titusville, Fla., Friday, April 29, 2011 for the shuttle launch. The launch of Space Shuttle Endeavour and its six crew members was delayed. NASA ... more 
JoAnna Gaut, protests the President's Obama's visit Titusville, Fla., Friday, April 29, 2011 for the shuttle launch. The launch of Space Shuttle Endeavour and its six crew members was delayed. NASA abruptly called off space shuttle Endeavour's final launch Friday because of a puzzling heater failure in a critical power unit, disappointing huge crowds converging on the area for the afternoon liftoff. on its final mission. less 
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Associated Press | Photo By J Pat Carter
Fri, Apr 29, 2011 3:44 PM EDT