According to Joan Walsh at Salon:
[Bill Clinton] left the stage to U2's "Beautiful Day," which then strangely segued into Robert Palmer's "Addicted to Love" — although the band cut off the refrain but the crowd shouted out the line they dropped: "You might as well face that you're addicted to love."
This calls for the 12" remix:
Let the healing begin.
(HT: Jim Chen)
UPDATE: CSPAN captures the precise moment of addictus interruptus:
Apparently, somebody at the convention noticed the problem and abruptly pulled the plug on the sound, but couldn't stop the audience from continuing the song.