Why do the Obama supporters claim that John McCain has no knowledge of economic matters?

but they also complain because he is successful, 7 homes, wife who maintains a 100 million dollar fortune, numerous vehicles, 26 years in the US Senate, Leader of the largest fighter squadron in the US Navy, and war hero, compared to a community organizer who has only voted present 130 times it appears he is very successful in everything he does. He is not an economist but then again neither is Obama so who will be the person to lead our nation through this financial crisis?