Bernie Sanders speaking in California on 17 May 2016
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US election: Sanders vows to fight on 'until the last vote is cast'

US Democratic presidential candidate Bernie Sanders has won the Oregon primary and narrowly lost Kentucky to Hillary Clinton.

Observers say he is unlikely, however, to be able to beat Mrs Clinton to the nomination because of her significant delegate lead.

But Mr Sanders told a rally in California - the next state to hold a primary - that he would fight on "until the last ballot is cast".

  • 18 May 2016