Leaving aside the fact that I don't seem to know the difference between a precinct and a county!!! (God knows why? I've filled enough American registration forms in before now). It would appear there's a few sub plots in the rural areas. Despite doing well in the West of Iowa, the dynamic (according to the BBC) was one of age, rather than urban/ rural, regarding Hillary's vote. In an number of precincts that they snapshotted, she seems to have been an 'unviable' candidate on the first ballot, which for someone who was 20pts ahead at one time, truly is testimony as to just how divisive she is. Loyal support, co-exists alongside outright loathing.
The other interesting factor, which is something I think we picked up on earlier, is her support amongst women voters. It would appear that Obama polled more than her, contrary to popular perceptions in the UK that women vote for Hillary etc The significance of a black male in a state that's something like 98% white (I find that stat difficult to believe myself) out polling a front running female candidate of her profile, amongst women voters, truly is significant. I think we've noted before that she's actually more unpopular amongst women than men, and that her female vote is kept within tight (and largely loyal sub-groups) but right now she can't be happy, with polls allegedly closing in around her in other states.
The decision to disqualify Florida won't help her, but she might have benefited from Michigan falling foul too, although she's left her name on the ballot there, where everyone else has withdrawn. I'm not completely convinced of the sense of doing this, as it can easily run the risk of turning Michigan into a Hillary referendum, and if all the anti votes fall in behind the stalking horse she could get very embarassed (provided of course, I've read and interpreted the events correctly)
