I am literally praying that he gets the nomination.
Before you lose your collective minds, hear me out.
Anyone who believes that it is important to prevent a republican presidency, and thereby republican control over the entire federal government (since they already control both houses of congress and the supreme court), should be doing everything possible to make Donald Trump the republican nominee. Trump's George Wallace style race-baiting, his xenophobia, his ignorant fact-less theories, and his general aggressive in-your-face a@#hole-ism appeals to a certain percentage of the republican base. They are the racists and low-information voters who are angry that the country is leaving them behind, and that their politicians are not somehow stopping it. Trump says the things that they think and sometimes say in private, but can not say in public, for fear of retribution, and they love him for it. Fortunately for the USA, and possibly for the human race, they are only a minority of the American voters.
Based on my conversations with people (both in person and online) the rest of the people, who do not fall into this subset of the republican base, feel very differently about Trump. They see him as a racist, a blowhard, and an all around a-hole, who does not have a single well thought out idea in his head. Their feelings for him range from general dislike to outright loathing (depending on whether he has personally offended them), and they are horrified at the prospect of such a disgusting excuse for a human being becoming president. In short, so many people already know that Trump is such a despicable person, that a Trump candidacy will almost guarantee victory for the democratic candidate.
But, just as importantly, a Trump candidacy could help the democratic party take back control of one or both houses of congress. If the republican party is forced to stand behind Trump and support him as their national candidate, then republicans will be associated with all the racist, ignorant, or just plain horrible things Trump says. His words remind people what many republicans actually believe (and what underlies many of their policy positions). And, as a republican, just by being associated with someone who is disliked as much as Trump is, could swing undecided voters to vote against the republicans. This is why many current republican office holders, who are up for reelection in 2016, are terrified of a Trump candidacy.