The former vice president's victories were another blow to Vermont Senator Bernie Sanders, whose early strength has evaporated as African Americans and working-class Whites across the country have sided with Joe Biden.
The Harvard graduate is the first Pakistani and Muslim American to head up a major presidential campaign.
Bernie Sanders drew a contrast with establishment favourite Joe Biden by noting Sanders fought a 2002 measure to authorise military action against Iraq. Elizabeth Warren and Sanders locked horns over his alleged statement "a woman can't defeat Trump.
US Senator Bernie Sanders says he would again seek the Democratic Party’s presidential nomination in 2020.
The White House press secretary Sarah Sanders says Hafiz Saeed’s release sends "troubling message" about Islamabad's commitment to fighting terrorism.
Democratic presidential hopefuls go head to head in fierce debate before upcoming New York primary
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