^^^ This is really one of the bigger problems in the post-Sanders era: any candidate who even slightly aligns with Sanders' message or personality basically gets a ton of internet buzz. Outside of some larger-than-usual fundraising for candidates who otherwise wouldn't get a second look because of obvious district composition and candidate quality, it amounts to absolutely nothing tangible in terms of making a district winnable. This is compounded by the fact that it's Ryan's district and so, of course, every cycle we get to hear about how we're going to beat Ryan, McConnell etc.
Ever notice how almost all of these no-name-but-made-great-by-the-grace-of-Sanders candidates find themselves in districts that can't ever be won in the first place? At least it makes for an easy out for explaining the failure of the "netroots" strategy.
To be fair, in Misty Snow's case, it's not like she'd be competitive in any of Utah's Congressional districts, or in any state house/senate race outside of Salt Lake City. So if she wanted to actually win anything, she'd have to go for those.
But otherwise, I agree that Berniecratic candidate seem to find themselves in a lot of super-Republican districts.