At caucuses, although it can take several hours, you don't spend the whole time arguing. In fact, at my caucus (I'm in Texas) there was no "arguing" (convincing others to support your candidate) since both sides met the threshold. There was a lot of waiting around though.
Hillary didn't have a problem with caucuses or the allocation of delegates when her husband ran, but now allofasudden it's undemocratic and unfair. I'm getting sick of that whiny talking point.
Looking back over the article again, the poll in which they are in a dead heat was for Michigan (if they had had a re-vote). The latest national polls show Obama at 46% and Clinton at 43.7%.
(source: RealClearPolitics - Polls)