My guess....
McCain has no policies, no programs, no core that is really his own. He was steered by Kennedy on McCain/Kennedy. Ditto by Feingold on Campaign Finance.
McCain would be very suseptible to advisors - maybe Forbes wants to be his advisor on economics and tax policy.
In many ways McCain is more dangerous than Obama. Obama is young, smart and a quick study. Notice how he got Volker on his team to help with economics.
McCain is too old and too slow to learn. He will be run by his advisors. How dangerous he will be depends on who he listens to last!
Thats as good a guess as any.
You know it had to be a quid pro quo kinda deal