Voter enthusiasm/engagement is very high in the new Pew poll, with 61% of voters saying they're more enthusiastic than usual to vote in the midterms. This question is usually a pretty good predictor of overall national turnout. pewrsr.ch/2ONPD0q 
Note, however, that GOP historically quite high by midterm standards -- it's just that Democratic enthusiasm is totally off the charts.
A pretty good #take is that with base turnout already expected to be quite high, the parties should spend the final 6 weeks of the campaign appealing to swing voters instead.
