I don't recall Palin campaigning for O'Donnell. She certainly didn't campaign for Akin, as she supported Steelman instead, who lost to him. I don't see what was so bad about what Mourdock said, so that one doesn't really bother me. And I don't know much about the Angle campaign.
I'll bet if you were a Conservative you'd be happy for Ted Cruz, Marco Rubio, Nikki Haley, Rand Paul, and the many others who she supported who won. She certainly has more wins than losses.
I said "campaigning", besides, I don't know if this is what you'd call a ringing endorsement:
On her support of Christine O’Donnell: When given a choice why in the world would I have supported the Liberal, the rhino, the pro Cap ‘n Tax, wishy washy on Obamacare [Mike Castle]. If given the choice of course I am going to support the conservative in that. And who was going to guarantee that Castle was going to win anyway…it’s a blue state. So given the choice, yeah, give it the old college try and allow the conservative in the race to have the message, the voice heard, and that’s what my endorsement allowed a little bit of a boost at least to allow some people to pay attention to what she was saying. Sarah Palin: I Gave Christine O’Donnell’s Campaign ‘The Old College Try’ | Mediaite