One reason Bernieworld decided to end this, despite there being 27 contests left: He was going to lose them. Sanders only won 45% of the delegates in those contests v Clinton, and campaign was not seeing any movement to him during the pandemic. https://www.washingtonpost.com/politics/paloma/the-trailer/2020/04/07/the-trailer-the-warning-from-wisconsin/5e8b325988e0fa101a75ba15/?itid=ap_davidweigel

Another risk, which first showed up in Michigan: Sanders was losing the sort of rural, working class white areas that he won in 2016. For years he'd point to his Midwest/Appalachia wins as evidence that those voters wanted his agenda. 1/2

Running and losing on the rest of this map - Indiana, West Virginia, etc - would blow that up. A socialist candidate who could win West Virginia can shake up politics and establishment thinking; a socialist who wins Vermont and California can't. 2/2