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US President Barack Obama (C) waves after delivering the State of the Union Address to a joint session of Congress as Vice President Joe Biden (L) and U.S. House Speaker John Boehner applaud on Capitol Hill in Washington D.C., capital of the United States, Jan. 28, 2014. [Photo/Xinhua]
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4. From US President Barack Obama to US Vice President Joe Biden on November 20, 2012:
" Happy birthday, Mr. Vice President ."