I majored in Economics. Since being on this board & researching admissions, I've had the thought in the past: "Gee, I should have majored in poli sci."
My GPA would probably be .3 - .4 higher. The chair of the department had told me that Econ majors had around the 4th or 5th lowest GPA in the school. But, you know what, I like Economics. I don't like Poli Sci..forget where you think you'll do better, do what you like. I don't think a higher GPA is worth missing out on studying a subject you enjoy, if you in fact enjoy it.
I hate the fact that we have to cater to admissions so much..but it is part of the game.