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 18 candidates across all ten allowed rankings.
Be sure to press the play button to animate the graph.
https://e.infogram.com/c67f8fc2-ccd3-4b6a-a3e2-28c96406e343?src=embedYouGov Dec 2019 Spread of Dem Candidate Rankings550742no0border:none;allowfullscreen