What concerns me most are his quirks , personality traits and pastimes. He is a compulsive gambler who spends upwards of 15 hours at a time shooting craps at thousands of dollars per roll. He is superstitious and has an anger management problem. These things are bound to impact on decision making processes especially since his neurons are not working as well as they once did because the blood does not circulate as well and amyloid deposits are starting to build up.
By contrast, Obama is a good poker player. He rare bluffs. He can often tell when others are bluffing. he looks at the odds. He usually finishes the evening a small winner.