Oops! : Vox Politics Obama, introducing Biden:
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Obama, introducing Biden:

Let me introduce to you the next President -- the next Vice-President! -- of the United States.

-- Evie Stone

UPDATE: The McCain campaign was all over this, immediately issuing the following statement:

Barack Obama sounded as though he turned over the top spot on the ticket today to his new mentor, when he introduced Joe Biden as the next president. The reality is that nothing has changed since Joe Biden first made his assessment that Barack Obama is not ready to lead. He wasn't ready then and he isn't ready now.