So the Democratic Presidential turnout last time around was 81.1 million, while the Republican turnout was 74.2 million or 52.2% to 47.7%, so basically a 4.5% spread. The real question here, as far I am concerned is, where is Trump actually picking up votes to close this gap? I don't see it, turnout is extraordinarily high, everywhere. However, even if you were to get into slanted distribution going the Republican way (which isn't happening), in order for Trump to reasonably close the gap to say 2% would required significant unequal distribution of almost 5 million votes, and if distribution is moderate but still in Republican favor, the total number of votes needed to close that number goes up dramatically. So basically, it becomes the stuff of unicorns, like Trump picking up 10 million votes against last time against a turnout increase of 14 million (that's not happening).
There is only one side here with enthused turnout, and yet the polls would have us believe this has narrowed? This is bumpkiss. The electoral college is a fickle bitch, so there is still a path for Republicans, but the idea that the national popularity contest has narrowed by any significant margin is nonsense.