I think the way Maine has tweeked the ECS and Colorado proposed on this years ballot is a very fair way to do it. Where the ECS votes for each state are split in proportion to the actual vote of the state, thus if you have a state that votes 70% D and 30% R, then the ECS votes are split the same way. It's the best way to assimilate the popular votes and keep the ECS alive, IMHO.