San Antonio Mayor Julian Castro waves as he arrives to speak at the Democratic National Convention in Charlotte, N.C., on Tuesday, Sept. 4, 2012. (AP Photo/Lynne Sladky)

Associated Press
San Antonio Mayor Julian Castro waves as he arrives to speak at the Democratic National Convention in Charlotte, N.C., on Tuesday, Sept. 4, 2012. (AP Photo/Lynne Sladky)
San Antonio Mayor Julian Castro waves as he arrives to speak at the Democratic National Convention in Charlotte, N.C., on Tuesday, Sept. 4, 2012. (AP Photo/Lynne Sladky)
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