Some of those she has endorsed have done quite well. Why would anyone expect that ALL of her endorsements would result in wins? NO ONE who goes out on a limb for lesser known candidates has that kind of accuracy.
Even Clint Didier in WA said that he was glad for her support, because it helped him get more well known in this race. If he decides to run in the future, he won't have that same hill to climb, since many folks will already know his name.
FWIW, I think SP would rather support a fighter who may have an 85% conservative approval rating than some mealy mouthed backbencher with a 95% rating. We need candidates who are going to be willing to take the fight to liberals 24/7 regardless of the issue.