A volunteer waits to receive credentials for President Barak Obama's acceptance speech during Charlotte's Democratic Convention at a campaign field office in Raleigh, N.C., Thursday, Aug. 23, 2012. (AP Photo/Gerry Broome)

Associated Press
A volunteer waits to receive credentials for President Barak Obama's acceptance speech during Charlotte's Democratic Convention at a campaign field office in Raleigh, N.C., Thursday, Aug. 23, 2012. (AP Photo/Gerry Broome)
A volunteer waits to receive credentials for President Barak Obama's acceptance speech during Charlotte's Democratic Convention at a campaign field office in Raleigh, N.C., Thursday, Aug. 23, 2012. (AP Photo/Gerry Broome)
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