Singer Katy Perry rehearses during a sound check on the final day of the Democratic National Convention in Philadelphia on Thursday, July 28, 2016.
Singer Katy Perry rehearses during a sound check on the final day of the Democratic National Convention in Philadelphia on Thursday, July 28, 2016. Paul Sancya AP
Singer Katy Perry rehearses during a sound check on the final day of the Democratic National Convention in Philadelphia on Thursday, July 28, 2016. Paul Sancya AP

Live video: Democratic National Convention, Day 4

July 28, 2016 1:34 PM

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