Effective executives don’t take things personally. They ruthlessly weed out the ineffective, deactivate the opposition, and institute effective remediation. He was a turnaround manager. Anyone who states that he doesn’t have experience in dealing with politics has not experienced the corporate milieu.
They have the world's largest corporate fleet, were for many years the largest employer in America, and largest civilian employer in the world, and operate just about everywhere and have to deal with everyone.
There are top end field managers there who could cut throats with the best of 'em. Their cousins at headquarters were just as bad.
Cain's history of employment is similar but he worked for relatively small organizations ~ compared to USPS. Romney and Huntsman have comparable experience but I don't think Huntsman feared getting fired or eased out.
Politicians have it easy in comparison.