(CNN) - Sarah Palin has a message for former top Bush aide Karl Rove: "Buck up."
Palin sent her message to Rove Wednesday on Fox News, after he expressed the doubt that Delaware Republican Senate nominee Christine O'Donnell does not "evince the characteristics of rectitude and sincerity and character that the voters are looking for."
"Well, bless his heart," Palin said. "We love our friends, they're in the machine, the expert politicos. But my message to those who say that the GOP nominee is not electable, or that they're not even going to try, well I say, buck up!"
Rove, on Tuesday, also said that O'Donnell had made some "nutty" statements prior to her victory.
Palin stuck to her message that competition within the GOP will produce candidates best suited for victory in November –a theory that may be proven incorrect, especially in Delaware where Republicans had hoped to take control of the Senate seat formerly held by Vice President Joe Biden. Democratic Senate candidate Chris Coons is now favored over O'Donnell in the general election.
Palin said the GOP should "put aside internal power grabs and greed and egos" and unite behind all of its nominees.
"I have absolutely nothing against Karl Rove or any of the guys who have much fatter political resumes than I will ever have, but […] they need to realize that the time for primary debate is now obviously over, and it's time for unity because the time for choosing is here," Palin said.
Palin endorsed O'Donnell just days before her primary victory, capping off a remarkable come-from-behind victory for the political newcomer and dealing the Republican Party establishment a significant blow in their hopes for regaining control of the Senate in November.