CEO's have the distinct disadvantage of being uncompromising. But without compromise, goverment shuts down. Governing is really all about compromise - you can only move an agenda forward to the degree possible. In business - a CEO can be all-powerful, so long as the board of directors is pleased. It's quite the opposite in the public sector.
A long resume is not an advantage either. There's too many skeletons that can be dragged out. Same thing with the time-honored history of long-time senators failing to reach the presidency, too many votes on too many issues becomes a liability.
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