It hasn't at all tho. Nevada was predicted to be 20% towards Hillary, and it only ended up being 4.3%. This is a huge win for Bernie supporters.
I wouldn't say
huge, but this has definitely hurt Clinton's campaign; the fact that she's only narrowly defeating an anti-establishment candidate shows both Democrats AND Republicans that she's not as strong as polls may describe. The fact of the matter is that she can't continue to eek out very narrow victories, especially in minority-dominated states where she needs every vote she can get. She's going to need a very large gap between her and Bernie come next Saturday, otherwise Super Tuesday could really go either way. She'll really be in deep stuff then.
I think the problem most people don't realize is that the GOP wants Bernie to get the Democratic nomination. There's a very clear reason they haven't been explicitly attacking him as much as they have Hillary, and it's because they're saving all of their "communist sympathizer" rhetoric for if he is nominated.