http://www.nytimes.com/2016/08/31/upshot/democrats-edge-in-voter-registration-is-declining-but-looks-can-be-deceiving.htmlFinally, this about sums up the reason why Republicans are gaining but why those gains mean basically nothing in terms of the final election results:
It's a very big article, but a good read. The gist is that people who were already voting Republican for years are just now getting around to changing their registrations. However,
new voters are still much more Democratic, akin to 2012. With that in mind, these gains in Republican registrations are not really going to make much of a difference.
I just wanted to post it because this talking point about how Republicans are gaining in registrations and thus must be doing well on the ground, is getting to be as false and meaningless as the "but look at the rally sizes!" retort.