This was widely reported, yet GOP voters chose the candidates anyway. If I was a Republican and I found out the DSCC was supporting a candidate, I would be less likely to vote for them.
Most people in the real world, don't pay attention to the insider baseball.
They see a bunch of ads saying "X is too conservative" and they think "he must be the best choice if Dems hate him so much".
So it has the opposite effect and conservative media tends to report this opposite to the way that it is reported in the rest of the media.
"Vote for the one they hate most, to own the libs basically".
I don't have the kind of faith in people that you guys do, so to me holding the sheep responsible for being sheep is a fools errand. And leading the sheep towards a cliff is on the sheep herder, especially if they drag you over the edge with them.