Mrs. Clinton probably won well-educated white voters by only a narrow margin, so the Pew result seems to imply a weakening in his standing. Mr. Trump’s best poll of the month, from Fox News, had his rating among college-educated white voters at just 45 percent. The competitive districts are mainly suburban, and there are startlingly few competitive working-class districts in the old Rust Belt that are traditionally Democratic but that are held by Republicans. None of this is to say that the white working-class voters who defined the 2016 cycle will be unimportant in 2018. In a wave election, many more white working-class districts could come into play elsewhere.

Source: New York Times February 22, 2017 10:30 UTC