Has GOP Disrupted Democrats’ Demographic Edge?

Politico: “The 2014 Republican landslide has both parties poring over the data, hoping to glean insights about the current state of the electorate before the 2016 elections. But it might take until the next presidential cycle to answer the most pressing question: Is Republicans’ 2014 success the result of significant changes in how voters view the two parties, or is the structural difference between the electorates in presidential and midterm years so great that Democrats still maintain a strong demographic advantage going into 2016?”