Why Democrats have an extraordinary opening

Democrats have a once-in-a-generation opportunity, akin to the first civil rights era, to reorder our politics. In the 1960s, southern whites shifted to the Republicans, while nonwhite voters in cities and young voters went to the Democrats. Now the tectonic plates are shifting once more. NBC News explains what has happened to the two parties:

Republicans have actually grown their advantage among white voters who do not have a college degree. They now hold a 24-point party ID edge with that group. In 2015, the GOP held a 21-point lead...