Obama Urges Unity Among Democrats

President Obama's been trying to unite the Democratic party behind Hillary Clinton – their nominee for US President.

Supporters of rival candidate Bernie Sanders are still upset that he didn't get to run for the White House.

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Mrs Clinton is the first woman to receive the Democrat's backing in Presidential election in the states. 

But at the party's convention in Philadelphia, Vice President Joe Biden (pron: bye-den) has been focusing on Mrs Clinton's credentials – and why people should reject Republican Donald Trump