Even with the political winds at their back, Democrats enter the 2018 congressional midterms at a historic geographic disadvantage. They also face demographic hurdles: Midterm electorates tend to be older and whiter than those that show up in presidential years. That’s part of the reason Republicans picked up so many House and Senate seats in 2010 and 2014.
But there is one crucial demographic dynamic working in Democrats’ favor: The 2018 midterms are poised to feature the most college-educated electorate in American history. …
This leaves Republicans dangerously exposed. Just as Obama’s legions of young supporters failed to show up at the polls for Democrats in 2010 and 2014, Trump’s base of whites without college degrees could leave the GOP stranded in 2018. CONT.
David Wasserman, FiveThirtyEight