The real story of the 2014 elections is that broad and shallow segments of the Democratic base saw nothing compelling to either vote for or against. As a result, they stepped aside and let the Republicans win. That is the big-picture reality; accept no substitutes.
Sure, the election produced plenty of interesting sidelights worth evaluating. But by comparison, these are just ants crawling across the carpet; the low voter turnout is the rhinoceros on the living room sofa.