We can see how many voters were willing to express some level of support for each candidate by simply accumulating the rankings. That is, if a candidate is ranked first, second or third by a majority of respondents, that demonstrates that the candidate has high overall approval in the field. The below graph has the cumulative rankings for all 20 candidates across all ten allowed rankings.
https://e.infogram.com/57266e18-7454-4a3d-a17e-489dcaf839d0?src=embedSpread of Dem Candidate Rankings666694no0border:none;allowfullscreen
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