Primaries, sort of like presidential elections are essentially meaningless, it is the delegates at the convention who choose the nominee. They are pledged to a candidate, but if there is an overall sense of unity, most candidates will not force their delegates to vote for them at the convention because they will usually drop out officially. Also in DNC primaries, after 1972 I believe, they created so called "super delegates" that IIRC make up about 30% of all the delegates and they are congressman and senators and other officals from within the party and establishment. This was meant as a precaution against an embarrassing defeat of the McGovern type nature.
If no one person becomes the clear winner of the primaries, there is nothing stopping them from choosing Hillary.
That pig might be liked by the same base of the democrat party that adores Howard Dean, But Hillary's problem is the vote she will attract to defeat her. I believe if she runs, the multitudes who rarely Vote will show up in record numbers to defeat her. No their politician in my lifetime is more divisive than Hillary Clinton and I hope her Carpet Bagging fat ass will be sent back to Arkansas and we will be shed of her once and for all