As stupid as the question probably is:
My teacher told me that some states allow it so that, say, New York's majority of votes are towards Kerry. But the electors can change the decision if they think we've made the "wrong" one and give all electoral votes to Bush. Is that actually possible in some states? I assume not, and I just wasn't paying attention enough in class.
Also, I think the whole electoral college system is pretty lame since some people's votes just won't count if the state is going to obviously be for one party. It would be better to split electoral votes based on the percentage of votes for each candidate.