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Former Vice President Joe Biden has enjoyed another stellar Tuesday, comfortably winning the Michigan, Mississippi and Missouri Democratic primaries.

The 'three Ms' were half of the states to participate in the fourth largest polling day on the Democratic primary calendar. Biden also won the Idaho primary, while the races in Washington State and North Dakota were closer and have not yet been called. 

Following a shock Biden surge on Super Tuesday, the results of today's primaries dealt a devastating blow to the Sanders campaign Non-Resident Senior Fellow Bruce Wolpe says.

“With Joe Biden's triumph in Michigan the nomination fight is effectively over, and Biden is all but certain to be the Democratic nominee for president.

"Even If Sanders takes Washington, it's barely a consolation prize and will not change the outcome, with Biden expected to also win big next week in Florida, Ohio and Illinois. Biden versus Trump in November," Mr Wolpe says.