Spread betting tycoon Stuart Wheeler hinted he may back Ukip in next year's European elections unless Mr Cameron hardens policy on Europe.
(Have a look at the comments there, there's a lot on our side.)
Or the Independent.
Stuart Wheeler, the rabidly Eurosceptic spread betting magnate who has poured an estimated £5m into Tory coffers over the past seven years, will today give a speech at the annual James Goldsmith memorial lecture in which he will urge the public to vote against the Tories unless they can convey a more Eurosceptic message.
"It's essential the Conservatives make two key manifesto pledges on Europe before the European elections next year," he tells me.
"They need to promise that if the Lisbon Treaty hasn't become law by the time they get to power, they will hold a referendum on withdrawing. And they need to pledge to renegotiate our European relationship, then hold a referendum on whether the negotiations were sufficient."
"I've always been a loyal Tory supporter and I'd prefer to back them but on this occasion, if they refuse to make those pledges, I'll be encouraging people to vote for another party."
Wheeler was courted last year by Ukip leader Nigel Farage, whom he described as "clever and articulate".
Would those promises be just like those the Labour Party made about a referendum on the Constitution though?