FILE - In this Sept. 4, 2012, file photo San Antonio Mayor Julian Castro addresses the Democratic National Convention in Charlotte, N.C. A deep obsession with the story of America, who

 

              FILE - In this Sept. 4, 2012, file photo San Antonio Mayor Julian Castro addresses the Democratic National Convention in Charlotte, N.C. A deep obsession with the story of America, who
FILE - In this Sept. 4, 2012, file photo San Antonio Mayor Julian Castro addresses the Democratic National Convention in Charlotte, N.C. A deep obsession with the story of America, who tells it, and who gets to write its next chapter, was a rare piece of common ground of speakers at both the Republican and Democratic conventions. We are telling America's story, they said. Castro's story was about his mother fighting hard for civil rights “so that instead of a mop, I could hold this microphone.” (AP Photo/J. Scott Applewhite, File)