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Democrats have an additional type of pledged delegate that Republicans do not: party leaders and elected officials, or PLEOs.

Seven candidates won at least one pledged delegate in the 2020 Democratic presidential primaries.

Heading into Tuesday’s contests, Biden held a 153 pledged delegate lead over Sanders.

It awards six pledged delegate - and in 2016 they broke four-two in Hillary Clinton’s favour over Bernie Sanders.

It involved Biden coming in second or third in Nevada, getting a modest win out of South Carolina, and using that to keep “within reach of Sanders’ pledged delegate plurality” and become “the favorite for a second- or third-ballot nomination” at the Democratic National Convention.