McCain: ? economics is not something I?ve understood--EXPLODE--http://digg.com/business_finance/McCain_economics_is_not_something_I_ve_understood--EXPLODE-- ?The issue of economics is not something I?ve understood as well as I should,? he says........ ?I?ve got Greenspan?s book.?.......His self-deprecating humor is attractive, as always. But shouldn?t we worry about a candidate who?s so out of touch that he regards Mr. Bubble, the man who refused to regulate subprime mess