A video shows the anchor dancing to Neil Diamond and singing on Thursday night.
In The Know
Lil Wayne fans saw similarities between a line in Clinton's speech and his hit "Sky's the Limit."
Biden is working to draw attention to efforts to combat sexual assault.
The $5 million event would have been Bieber's largest-ever payday.
Ben Kamisar 07/29/16 10:12 AM EDT
His speech, however, topped hers on Thursday night.
His cameo on the show will highlight a backlog of rape kits.
Gingrich had been on Donald Trump's vice presidential shortlist.
"The Today Show" host suggested the daughters sit down and discuss the tone of the campaigns.
Duckworth is slated to speak in the early evening at the Democratic convention.