Big difference - Scozzafava was appointed.
Carly has put herself up to a vote in a primary election by party members.
Sarah is free to endorse anyone she wants, for whatever reason she has.
If Devore can win the primary he deserves to be the candidate. Same holds for Carly.
And I'm quite sure Palin will support whoever wins the primary. And a robust primary can be a good thing, not a bad thing.