Los Angeles Mayor and Democratic Convention Chairman Antonio Villaraigosa flashes a thumbs up to open today session at the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/J. Scott Applewhite)

Associated Press
Los Angeles Mayor and Democratic Convention Chairman Antonio Villaraigosa flashes a thumbs up to open today session at the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/J. Scott Applewhite)
Los Angeles Mayor and Democratic Convention Chairman Antonio Villaraigosa flashes a thumbs up to open today session at the Democratic National Convention in Charlotte, N.C., on Thursday, Sept. 6, 2012. (AP Photo/J. Scott Applewhite)
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