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US Vice President Joe Biden gives two thumbs-up prior to US President Barack Obama delivering the State of the Union address before a joint session of Congress on January 28, 2014 at the US Capitol in Washington.  AFP PHOTO/Saul LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)
US Vice President Joe Biden gives two thumbs-up prior to US President Barack Obama delivering the State of the Union address before a joint session of Congress on January 28, 2014 at the US Capitol in Washington.  AFP PHOTO/Saul LOEB        (Photo credit should read SAUL LOEB/AFP/Getty Images)

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Is Biden making a swipe at Hillary Clinton?

Vice President Joe Biden is taking some not-so-subtle swipes at Democratic presidential front-runner Hillary Clinton. CNN's Jeff Zeleny reports.

Is Biden making a swipe at Hillary Clinton?

Vice President Joe Biden is taking some not-so-subtle swipes at Democratic presidential front-runner Hillary Clinton. CNN's Jeff Zeleny reports.