Let’s figure that the enrolled Ds split between the urban moderate and the suburban liberal, but there is a groundswell of unenrolleds who come into the primary to vote and nominate the conservative professor, who wins with 36% of the vote (the other two get 32% each).
Now you have a Democratic base, where 64% of the vote and close to 100% of the enrolled Democrats now have a candidate that none of them wanted.
To make the case study more interesting (extreme), half of the unenrolleds who voted in the Democratic primary for the conservative will vote for the Republican in the primary.
Play on that hypothesis. Is this right? What do the Democrats do? Should we amend the laws to prevent this scenario from happening, and if so, how?