Perhaps you haven't really been paying attention since Palin began endorsing (and working her butt off for) conservative Tea Party candidates. Her win/loss ratio falls far outside the realm of mere chance.
She's the E.F. Hutton of Republican politics.
I'm not seeing it in the TX primary (the polls in the race showed Cruz doing quite well before her endorsement & later campaign appearances), and Orrin Hatch was an incumbent and incumbents' odds of being re-elected are over 90%.
However, I am not familiar with other races like Fischer, so I'd be interested to see what's there.
Prove me wrong, but right now, I don't see any endorser as being a kingmaker, even if that person is Sarah Palin (a great person to have with you on the trail - absolutely - but kingmaker I don't see).