So she is doing roughly the same in Georgia and Iowa? Weird, and shouldn't the difference between the midterm and presidential electorate be a lot more dramatic in GA than in IA?
I don't think it's that weird. Hillary isn't really a good fit for Iowa, while the Clinton brand has always done well down South. I think it's perfectly possible that she would do better in GA than in IA in a presidential election. I'd also suggest that the difference in Georgia's electorate between midterm and presidential (at least recently) isn't that extreme when you consider how party is polarized by race. More than anything, we saw in 2010 a huge national wave and in 2006 (despite a Dem wave) the continued collapse of Democrats in Georgia at that time. Usually, midterm turnout is 1-3 points whiter than the previous presidential election, and with it being polarized by race like I mentioned, this shouldn't (in two comparable climates) produce a huge variance in and of itself.
Quick, someone post the "Blue Georgia is evolving into Red Georgia" gif!