With dozens of Democrats lining up to run for President in 2020, now is the time to adopt ranked choice voting in early states to guarantee that primary winners have clear majority support. Greater choices for voters is welcome, but crowded primaries can produce “winners” with less than 25 percent of the vote. Meantime, millions of Democratic voters could fail to elect any delegates at all because their candidate falls below the 15 percent qualifying threshold. Someone could easily win the nomination over the expressed opposition of most primary voters.

Consider the 2016 Republican primaries, which featured more than a dozen credible candidates. With provocative rhetoric making him the favorite of a passionate minority, Donald Trump captured the nomination despite falling short of a majority in the first 40 primaries and caucuses and polls indicating he would have lost in most early contests in head-to-head races against opponents like Sens. Marco Rubio (R-Fla.) and Ted Cruz (R-Texas).

Next year’s Democratic race presents the same fractured dynamics. Moreover, Democrats require states to allocate delegates in proportion to the vote, so that a candidate winning a state with 33 percent of the vote takes about a third of the delegates, not all. This “fair reflection” principle makes more votes count. But winning the nomination on the first convention ballot requires a candidate to arrive with more than half the delegates; otherwise, super-delegates have an equal say in deciding a brokered convention. Democrats will need as much fine-grained information as possible about what their voters really want.

Current voting rules can also turn the goal of a “fair reflection” into a distorted funhouse mirror. To earn delegates, a candidate must exceed 15 percent of votes; all others are shut out. In caucus states like Iowa, backers of candidates below this threshold can move to a backup second choice to make their vote count. But “single choice voting” allows no backups. With a crowded field, more than half the vote easily could be cast for candidates below the threshold; it’s even possible that no candidate would qualify for delegates in some states. Expect finger-pointing among like-minded voters splitting the vote, tied to factors like shared ethnicity (African American Sens. Cory Booker and Kamala Harris), ideology (progressive Sens. Elizabeth Warren, Sherrod Brown and Bernie Sanders), and experience (several mayors may run).

Ranked choice voting (RCV) is the best way to allow greater voter choice without wasted votes and unrepresentative winners. RCV was used successfully last year in Maine’s congressional election and has been adopted for elections in 22 American cities and counties and the national legislatures in Australia and Ireland and for most party leader elections in Canada, New Zealand and the United Kingdom.

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