Why draw a distinction between the working class and the white working class?

[progree]

10. The white working class vote is also EXTREMELY VERY regional

This is from 9/30/2012 --

...poll conducted a few weeks ago by the Public Religion Research Institute in Washington, D.C., ... that poll found that in the South, among white working class voters, Republican Mitt Romney leads Obama by the astounding vote of 62-22 percent — a 40 percentage point difference.

The poll defined working class as having less than a bachelor’s degree and being paid by the hour or by the job.

No other region in the country had anywhere near that differential. In the West, Romney led by just 5 percentage points among white working class voters. In the Northeast, he leads by 4 percentage points. And in the Midwest, Obama leads Romney by 8 percentage points among white working class voters.

[div class="excerpt" style="background-color:#CEF6FE;"]So the margins for Romney over Obama in this poll were (among white working class voters):
South: +40%, West: +5%, Northeast: +4%, Midwest: -8%

The link [font color = red]WAS[/font] at: http://www.courier-journal.com/article/20120930/COLUMNISTS21/309300041/1001/Joseph-Gerth-Polls-suggest-Kentucky-voters-gone-South?odyssey=mod%7Cnewswell%7Ctext%7CHome%7Cp

I don't remember what the title of the article was either. Oh well. I did some Googling but had no luck. I suppose I could try the Way Back machine...

I sure wish I had something like this for 2016