Once upon a time, a rich and powerful father gathered his four young sons and urged them to become rich and powerful, too. Take risks. Push yourselves. Influence others, he ordered in a bold voice. Then he whispered, "And if you muck things up, a fairy godfather will always appear to make things better." Those may not have been the precise words spoken, but this is no tall tale. It's the business model adopted long ago by George and Barbara Bush to propel sons George W., Jeb, Marvin and Neil into the high ranks of industry and, at least for ...