If Dems were smart they would do it while they were IN power; like I said earlier... Obama (or a person like him) would say, "I won 52% of the vote but 67% of the electoral college. That is not right. Republicans' votes should count for more than that. Everyone's vote should be equal."
Back the opponent into a corner where they can't disagree with you.
Complaining when you lost because of it won't help much (as evidenced by everyone ragging on me now). Changing it when it looks like you're not out to help yourself as much would be a better strategy.