 On April 29 , 2011 , the first launch attempt of STS @-@ 134 was scrubbed . Kelly 's wife , Gabrielle Giffords , traveled to Florida on her first trip since moving from Tucson to Houston in January after an attempted assassination . Giffords ' appearance at Kennedy Space Center gave the launch a high profile , " one of the most anticipated in years , " according to the New York Times . President Obama visited the Kennedy Space Center on April 29 on a trip with the original intention of watching the Endeavour launch . 
