Is Joe Biden the president of USA?

Joe Biden the gaffe machine was at it again Saturday.
Speaking at the Iowa State Society inauguration ball, the Vice President said, "I'm proud to be President of the United States" (video follows with transcribed highlights and commentary):
After some laughter and a nudge from someone on stage, Biden corrected himself.
"I'm proud to be Vice President of the United States," he said, "and I'm prouder to be Barack Obama, President Barack Obama's Vice President."
"Well, there goes that," Biden joked. "Look, on a serious note, I guess I'm lucky to get back to a serious note."
This of course wasn't the first time Biden was confused about who's in the White House. In November, he referred to Obama as President Clinton.
But that's only the beginning:
And this is a man America's media will gleefully support in 2016 if he wins his party's nomination for president.

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