The IDEA that someone can be nominated with a consistent 60% against him is so ridiculous, I can’t even think about it.
This is due to rules like winner-take-all, top-2-only, etc. plus the superdelegates who are party members who choose their own candidate. Mitt may have only 40% of the popular vote, but he has over 50% of the delegates. If that trend holds, he'll get the nomination. This is why in a multi-candidate race, voters ought to be able to rank the candidates or score the candidates rather than just pick one. Knowing who a person's second or third choice is is important and should be counted in the vote tallying somehow.