Ya the last thing we want for a President is a smart person who has made it on his own. Many would prefer to have another POTUS who needed their daddy around to bail them out when they screwed up. A person who did not put much stock in decision making and learning. Yup you're right some people feel more comfortable voting for another screw up. Someone who might be just like themselves.
We may not be having Presidential elections in 2012, if things stay the same. as for suffering 4 more years just because I'd know what to expect, I think I would take door # 3 and the unknown,