Ron Brownstein: “The clearest opportunity for Democrats is the relatively few remaining Republican-held districts in blue metro areas with large populations of college-educated whites, and in many cases substantial minority and youth populations as well. These are places crowded with voters who tilt toward liberal positions on social issues and recoil from Trump’s volatile persona, particularly the way he talks about race.”

“The next bucket of seats is demographically similar to the red pockets but politically distinct because they are in metro areas that lean much more reliably toward the GOP. I call this group of seats Romneyland because they are filled with voters who resemble Romney demographically and ideologically: professionals and corporate middle managers who want a president who will shrink government and even pursue a center-right social agenda, but also exude professionalism and decorum.”

“The third key test for Democrats is the districts I call ‘blue-collar blues.’ These are the blue-collar, exurban, small town and rural seats in states that generally lean Democratic.”