And other candidates she endorsed/supported won their primaries (e.g., Ted Cruz in TX). You win some, you lose some; but on the whole, her track record is pretty good.
Her nich seems to be giving last minute endorsements to conservatives in Republican primaries.
I don't know of anybody who, as of last night, was still waiting for her direction in the presidential race.
Akin made a gaffle shortly after the primary. Palin condemned him and has never retracted her statement.
Akin is very conservative and is running against Claire McCaskel an ultra liberal who voted 95% of the time with 0bama including 0bamacare.
Perhaps Palin thought that if Akin would withdraw her candidate would replace him. She may have been ignorant of Missouri's Sore Losers Law.
Just another reason to never donate to a PAC.