Is Sarah Palin about to endorse Donald Trump?

Donald Trump is teasing a "major announcement" and a "very special guest" at his campaign stop in Iowa later this afternoon, leading to quite a few rumors that Sarah Palin could be endorsing Trump.

Rumors started flying after a charter jet left Anchorage, Alaska on Monday, and landed in Des Moines, Iowa — which raised suspicions that the former Alaska governor was on board. However, according to The Washington Post, it's hardly a sure thing: The Anchorage plane left Des Moines for Tulsa within half an hour, meaning the Iowa stop could have just been a refuel before it reached its final destination.

But if a Palin endorsement is impending, it could be a major blow to Ted Cruz, who Palin backed during his initial bid for the Senate. A Cruz aide told Politico that he would be "deeply disappointed" if Palin indeed backed Trump. On CNN, Cruz spokesman Rick Tyler ranted that if Palin were to throw her weight behind Trump "it'd be a blow to Sarah Palin, because Sarah Palin has been a champion for the conservative cause, and if she was going to endorse Donald Trump, sadly, she would be endorsing someone who's held progressive views all their life on the sanctity of life, on marriage, on partial-birth abortion."

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When Gallup last polled about Palin in 2013, only 35 percent of Americans viewed her positively — but an entire 61 percent of Republicans did, making her eventual endorsement all the more interesting.