Wealthy Wall Street financiers and other business figures provided crucial support for Mr Obama during the election, backing him over the Republican candidate John McCain as the right leader to rescue the collapsing US economy.
But it is now dawning on many among them that Mr Obama was serious about his campaign trail promises to bring root and branch reform to corporate America - and that they were more than just election rhetoric.
A top Obama fundraiser and hedge fund manager said: "I'm appalled at the anti-Wall Street rhetoric. It was OK on the campaign but now it's the real world. I'm surprised that Obama is turning out to be so left-wing. He's a real class warrior."
Let's hope so.