The end of the article is interesting. Whites in general are increasing in cities? Certainly that's reversing a trend. Maybe the Republican trend among whites will stop or be decreased by this.
Most of the Republican's gains among whites has been in the South and Appalachia. Outside of those areas there are actually places where Democrats are gaining white votes. Which shouldn't be surprising, considering Romney lost places like Wisconsin by 7% while Bush only lost it by 0.4%. Also Romney didn't win Iowa or NH while Bush won one in each of his elections.
I agree. It seems increasingly like Democrats have a hard floor around 37-39% of the white vote. Note that it has been stuck in that narrow range in 2010, 2012 and 2014. Dem margins with minority groups, probably more so than turnout, were the difference between 2010 and 2012. After all, what does the current GOP platform have to offer a white person who voted for Obama twice?
That depends on their income and the field they work in.