I've heard at least one good explanation of why someone was opposed to him. I can understand that. But I'm aware that there is agressive demonization that goes beyond a reasonable dislike of a candidate. To the point that I'm convinced there is a hidden grudge that is hidden behind the illogical claims that "he is doing too much harm to the republicans so lets elect Obama to the Senate to keep him from doing more harm."
It's one think to argue he isn't the best candidate. It's another thing to absolutly trash the man and anyone who supports him when he IS in fact the nominee. I'm not from Illinois, and I don't know all that much about what's going on right now. But I've been watching people is the entertainment industry trash republicans long enough to know "hidden agenda demonizaion" when I see it.
The good and interesting part is that there is much to learn from who is saying what and how often. Some hidden agendas among the regulars,I would say.
Basically, the Illinois GOP is in the same position that the Illinois Dems were in about twenty years ago, when a bunch of LaRouchies got themselves nominated by running under-the-radar primary campaigns. The Dems (correctly) decided that the only way to prevent their normal candidates from being dragged down by the outpatients was to firmly denounce the latter.