Giddy Kamala Harris calls Biden 'vice president' at July 4 event

Kamala Harris accidentally referred to as the 'vice president,' , during a July 4 event at the .

With many wondering if she could replace Biden as Democrats' candidate for president were he to drop out, she was positively giddy while giving the speech.

She said: 'We give thanks to our commander-in-chief, the vice - the president of the United States! The extraordinary President of the United States Joe Biden!'

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