Researchers in Hungary examined how people assessed whether a particular act was stupid or not. They found people tend to agree at rates of 90 percent in judging someone acting stupidly.
They determined that stupidity derives from three basis causes:
Confident ignorance – when someone overestimates their own abilities
Absent-mindedness – where a person simply forgets or wasn’t paying close enough attention
Lack of Self Control – when a person’s impulsiveness gets them into trouble.
You can decide for yourself which applies to the Obama voter, or Obama himself.