Your vote doesn't count in non swing states now. For example, here in CT people just look for the democrat and select him. There is no chance of anyone else winning CT. So my vote is worthless. If we switched to a popular vote, all votes are equal. There are no swing states that get all the attention. Or you could eliminate labeling parties on ballots, that way voters could not easily chose democrat and would be forced to actually know the candidates. In this case, my vote at least has a chance of counting.