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Billionaire David Koch is backing Wisconsin Gov. Scott Walker for president and is pushing Florida Sen. Marco Rubio as his running mate.

Koch — who has been attacked by Democrats for his generous support of conservative causes — hosted a fund-raiser for the Republican Governors Association at his Palm Beach mansion last month, where 10 governors met with 90 deep-pocketed Republicans.

“I am supporting Scott Walker,” Koch told one guest in the ballroom of his 30,000-square-foot mansion. “I like how he took on the unions and won, and reduced the state’s debt.”

Koch, whose Koch Industries donated $5.275 million to the RGA last year, also said, “I told Scott Walker that Marco Rubio would be a good vice president. Gov. Walker agreed and said, ‘That’s a great idea. He’s a perfect choice.’”

As for Jeb Bush? “We’ve had enough presidents named Bush,” Koch said. Asked why Jeb is running, Koch replied, “He’s had two relatives that were president. He thinks it’s his turn.”

And former Texas Gov. Rick Perry? “I like him, but he can’t win,” Koch told my source.

A spokeswoman for Koch dismissed these quotes as “hearsay” and gave me this statement from the former MIT basketball star:

“While I think Gov. Walker is terrific, let me be clear, I am not endorsing or supporting any candidate for president at this point in time.”