Sarah Palin's endorsement of Donald Trump may not matter in Iowa

Using media coverage, her Facebook page, her PAC website and its online archives, Bloomberg Politics also reviewed her 2014 endorsements and found her endorsees succeeded in winning office less than half the time. (Palin’s political action committee, SarahPAC, did not respond to request for a complete list.)

In addition, voters in Iowa, which holds its caucuses Feb. 1, have expressed doubt over just how helpful Palin’s endorsement is. A month before the 2014 midterm election, 56 percent of likely Iowa voters said that Palin’s endorsement of Joni Ernst would do “more to hurt” than help her chances of winning a seat in the U.S. Senate, according to polling from Selzer & Co., which conducts Iowa polls for Bloomberg Politics. Just 30 percent said it would help. Ernst won anyway.

In that same survey, 57 percent of likely Iowa voters, of all affiliations, viewed her unfavorably, although only 16 percent of Ernst supporters said the Palin’s endorsement was a “problem.”