Scott Walker was under pressure. It was September 2011, and earlier that year the first-term governor had turned himself into the poster boy of hardline Republican politics by passing the notorious anti-union measure Act 10, stripping public sector unions of collective bargaining rights.

Now he was under attack himself, pursued by progressive groups who planned revenge by forcing him into a recall election. His job was on the line...

...He asked his main fundraiser, Kate Doner, to write him a briefing note on how they could raise enough money to win the election. At 6.39am on a Wednesday, she fired off an email to Walker and his top advisers flagged “red”...

...Her advice was bold and to the point. “Corporations,” she said. “Go heavy after them to give.” She continued: “Take Koch’s money. Get on a plane to Vegas and sit down with Sheldon Adelson. Ask for $1m now.”