Also Michigan and Iowa have similar patterns...in 2008 she won Michigan in the primary without Obama on the ballot( the State was punished for moving its primary before ST, violating party rules) and with only 55% of the votes despite being the only serious candidate on the ballot( uncommitted option had 40%), in 2016 lost narrowly with Sanders and Trump despite having in both cases a certain adventage in the polls...in Iowa she lost to Obama in 2008 in a momentous vote, won by a nail-biter against Sanders in 2016 primary( at least in the State delegates count, maybe the popular vote was different) and lost big vs Trump...definitely these three States are not her territory. In Ohio and Pennsylvania, on the other hand, she defeated both Obama and Sanders and not by few, before losing against Trump...I wonder why OH and PA primaries didn't highlight the same problems for her in the Region that the other three States showed clearly twice.
Hillary clobbered Obama in Ohio and Pennsylvania in 2008 due to some racialized polarization amongst white dems that happened less with whites in Illinois, Iowa, Minnesota, Wisconsin.
I heard in Ohio she won in 2016 only because some sanders supporters decided to skip the democratic ballot to vote for Kasich to beat trump in the state. Although im sure she would had won but instead of 10 points it would be 2-4%. In Pennsylvania she won because yes its a closed primary but a lot of potential anti-hillary pro-trump dems that would had voted for Bernie just because they disliked Hillary had switched to the republican party or stayed home(Bernie was pretty much losing when the Pennsylvania primary happened which probably reduced his turnout).