"Although the Mercers had initially been persuaded to back Texas senator Ted Cruz in the Republican primary, Bannon preferred Trump, and by the time of the Republican National Convention the Mercers were with him. Rebekah made her move last August, at a fundraiser at the East Hampton estate of Woody Johnson, the owner of the New York Jets. According to two sources, one who strategized with the Mercers and another who worked closely with Trump, Rebekah insisted on a 30-minute face-to-face meeting with Trump, in which she informed him that his campaign was a disaster. (Her family had pledged $2 million to the effort about a month earlier, so she felt comfortable being frank.) Trump, who knew her slightly, was willing to listen. He had been disturbed by recent stories detailing disorganization in his campaign and alleging ties between Trump's campaign manager, Paul Manafort, and pro-Russia officials in Ukraine. Rebekah knew of this and arrived at her meeting with “props,” says the source who strategized with the Mercers: printouts of news articles about Manafort and Russia that she brandished as evidence that he had to go. And she also had a solution in mind: Trump should put Bannon in charge of the campaign and hire the pollster Kellyanne Conway.
By the following morning, Rebekah was breakfasting at Trump’s golf club in Bedminster, New Jersey, with the two people he trusts most, Ivanka Trump and Jared Kushner, to talk through the proposal in more detail. Within four days, Trump did exactly as Rebekah had advised. Manafort was out. Bannon was in charge. Trump also brought on David Bossie, the president of Citizens United, with whom the Mercers and Bannon had been close for years."and wonderful Cruz campaign dis after the Mercers dumped Cruz (cretin with a rich father!):
"She is somewhere between the daughter of a brilliant hedge fund manager and mathematician and somebody who runs a bakery in New York. She clearly has a skill set, but the skill set we’re discussing here regarding the understanding of the value of data and analytics doesn’t fall into that area. She is operating under the information she’s been given."
Also note how the role of Cambridge Analytica - the cool name chosen for the American branch of the Mercer outfit SCL Group - in the Trump win has been completely over hyped.
"How Secretive Manhattan Heiress Rebekah Mercer Became One of the Most Powerful Women in Politics".