His decision removes Democratic front-runner Hillary Clinton’s biggest potential obstacle to the party’s nomination.
It is thought Biden who is mourning the death of his 46-year-old son Beau from brain cancer did not relish a gruelling campaign.
The 72-year-old ran for president in 1988 and 2008, both times failing to gain traction despite more than three decades as a US senator from Delaware.
Biden rules out presidential bid - VIDEO
22 October 2015
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US Vice President Joe Biden has announced he will not be running for president in 2016.
