Dalilah Muhammad takes a victory lap after winning the senior women's 400-meter hurdles at the U.S. Championships athletics meet on Sunday, June 23, 2013, in Des Moines, Iowa. (AP Photo/Charlie ... more 
Dalilah Muhammad takes a victory lap after winning the senior women's 400-meter hurdles at the U.S. Championships athletics meet on Sunday, June 23, 2013, in Des Moines, Iowa. (AP Photo/Charlie Neibergall) less 
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Associated Press | Photo By Charlie Neibergall
Sun, Jun 23, 2013 8:51 PM EDT