That latest NBC/WSJ poll had the House bill at an incredible 16% approval, 48% disapproval. At that level of universal disapproval I don't think it is a losing strategy to rage against that everywhere, even in wealthy suburban districts. Especially if it passes and becomes law.
Which kinda shows that ultimately the midterms are always a reflection on the president more than anything. If Trump gets into more and more hot water over Russia and Comey, that will be the main issue. If Republicans actually pass BCRA, that will be the main issue of 2018.
http://msnbcmedia.msn.com/i/TODAY/z_Creative/17255%20NBCWSJJunePoll.pdf