Sanders to 'assess' campaign after Biden sweeps latest primaries

Leftist Bernie Sanders was under fresh pressure Wednesday to bow out of the race for the Democratic White House nomination after losing the three latest primaries in contests hobbled by the coronavirus pandemic.

Political moderate Joe Biden swept all three of Tuesday's contests, building a solid lead in delegates to the party's July nominating convention as Democratic voters appeared to coalesce around him as the best chance to defeat President Donald Trump in November.

Sanders, once the race's frontrunner, was considering his options as more states postponed their primary votes amid a national shutdown for the COVID-19 emergency. "The next primary contest is at least three weeks away," said Sanders' campaign manager Faiz Shakir in a statement.

"Sen. Sanders is going to be having conversations with supporters to assess his campaign." Biden handily trounced Sanders in each of Tuesday's battlegrounds. In the biggest prize of Florida, the 77-year-old former vice president grabbed 62 per cent of the vote against 23 per cent for 78-year-old Sanders.

In Illinois, Biden topped 59 per cent to Sanders' 36 per cent, and in Arizona, Biden came in with more than 43 per cent to Sanders' nearly 32 per cent, while former New York mayor Michael Bloomberg, who has already withdrawn from the race, came in a distant third.

Biden has now won 19 of the 24 contests, with just over half to be held.

The victories underscored Biden's position as the party's frontrunner and the eagerness of Democratic leaders and party rank and file to come together around a moderate flag bearer, to challenge Trump.

According to a count by RealClearPolitics, Biden has racked up 1,147 delegates to Sanders' 861, with 1,991 needed to capture the nomination.

Given Biden's solid lead in national opinion polls among Democrats and in many of the states yet to hold primaries, Sanders faces a very steep battle to overtake his rival. "Our campaign has had a very good night," Biden said in televised remarks from his home in Delaware.

"We've moved closer to securing the Democratic Party's nomination for president, and we're doing it by building a broad coalition that we need to win in November."