Why is intelligence frowned upon by some?

Why do some seem to be put off by someone of great intelligence? They almost frown upon this individual, perhaps call him/her "elitist". This seems to be especially the case in the world of politics. Why? Why wouldn't we want an intelligent person to represent us in office? Politicians and not to generalize, but more times than not Republicans, seem to want to convince the people that they're just like them and the opposition is of a higher education, have been privileged all their lives and can't fully understand the needs of the middle- and lower-classes in this country. However, that's not true. Let's face it. An overwhelming majority of politicians, of both parties, have above-average intelligence (with a few exceptions, of course... Mr. Dubya) and a majority won't be able to completely comprehend what most middle- and lower-class people have to deal with on a day-to-day basis. Some people buy the bait, though. They truly vote based on who they feel they could site down and have a beer with. I'd love it if a politician representing me were both personable and intelligent, but if I had to choose one over the other, I'd vote for the person whom possesses great intelligence and have a drink with the other guy whom possesses the great personality.