In Defying the Odds, we discuss the 2016 campaign. The 2019 update includes a chapter on the 2018 midterms. The 2020 race, the subject of our next book, is well under way.
If several candidates remain in the race but fall short of the 15% threshold, that enlarges the delegate haul for the candidates above the 15% threshold. As the winner of the New Hampshire primary and the Nevada caucuses, and a close second in the Iowa caucuses, Sanders has already benefited disproportionately in delegate allotments. In Iowa, Sanders won 26% of the vote but got 30% of the delegates; in New Hampshire, he won 26% of the vote but got 38% of the delegates; and in Nevada, he won 47% of the vote but secured 67% of the delegates.
A candidate with a solid base of supporters, like Sanders, is well positioned to collect some delegates in almost every contest. Until the field narrows, meanwhile, the anti-Sanders vote will be splintered. The longer this splintering continues, the easier it is for Sanders to build his delegate lead.