You ask an astute question, gigantikok. My reason could be evenly split, 50/50, between his politics/persona.
Being raised by a strong Republican Mother and a strong Democratic Father, I always tried to consider the candidates rather than their party until Ronald Reagan proved , with the backing of his party, how little he thought of peoples' lives when he wouldn't dare even say the word "HIV" (AIDS) until after literally thousands of lives had been lost to the disease.
And then along came Bill Clinton and I have the pleasure of knowing him personally and knowing for a fact that no one respects life more than he does, regardless of every type of diversity. No, I can't justify his not being honest with his answers concerning his sexual exploits, but Reagan's callousness makes Clinton's actions look little by comparison.
As for dubya as a person, I respect intelligence and knowledge and think they are both prerequisites for the leader of a country. I find a difference in laughing 'with' a person and laughing 'at' a person. I had rather not laugh AT my preisdent -- just try to get him out of my mind and know this, too, will pass!