Few job prospects leads to souring on the predominant economic establishment and combined with college debt loads, which makes these the spiritual successor to the debt laden farmers of the WJB era, with low crop prices being the equivalent of fewer job prospects.
All this points to support for Democrats.
All of this but I would also argue that higher education attainment also leads to more empathy and a more flexible worldview which meshes better with the Democratic messaging on the importance of diversity and clashes with the over-emphasis the GOP puts on upholding white, Christian cultural norms, preferences, and morals.