The proper term would be "Mr President" or "Sir" in public. In private, it is possible he refers to President Obama by his first name.
Barack Obama is 48 and Joe Biden is 66 as of August 2009.
Barack Obama is the President of the United States of America. Joe Biden is the Vice President.
Joe Biden
joe biden
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Joe Biden
Joe Biden will be president.
Joseph Robinette (Joe) Biden Jr. is the Vice President of the United States under President Barack Obama. He was formerly a senator from Delaware.Biden served two terms with Obama, from 2009 January 20 to 2017 January 20. He was replaced by Mike Pence from Indiana.
Barack Obama is the president. Perhaps you are asking about his vice-president-- that is Joseph "Joe" Biden.
Barack Obama's vice presidential running mate was Senator Joe Biden.
Senator Joe Biden of Delaware.
Barack Obama Joe Biden