Hmmmm not too far off from my map guessing how a referendum to override the decision would go:
(I forgot about Ames/Storey County when I made it)
You seem to underestimate the FFness of Jefferson County, and also underestimated the effectiveness of Vander Doouche's campaign in your map. quite a few of those counties that appear in the 60% range were on the verge of 70%'s, like .1% away in 3 or 4 cases, and with the exception of Linn, and a couple others, most counties that appear green on my map are green by not large numbers.
