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DANVILLE, KY - OCTOBER 11:  U.S. Vice President Joe Biden smiles during the vice presidential debate at Centre College October 11, 2012 in Danville, Kentucky.  This is the second of four debates during the presidential election season and the only debate between the vice presidential candidates before the closely-contested election November 6.  (Photo by Chip Somodevilla/Getty Images)
DANVILLE, KY - OCTOBER 11:  U.S. Vice President Joe Biden smiles during the vice presidential debate at Centre College October 11, 2012 in Danville, Kentucky.  This is the second of four debates during the presidential election season and the only debate between the vice presidential candidates before the closely-contested election November 6.  (Photo by Chip Somodevilla/Getty Images)

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Biden won't deny a 2020 run for president

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Biden won't deny a 2020 run for president

Former Vice President Joe Biden is sending mixed signals on whether he's running for president in 2020.