An interesting article in the Economist a couple of weeks ago.
Namely, should the whole idea of the electoral college be consigned to the dustbin and move to a pure popular vote? If not as radical as that should the Congress-districts be the winner-takes-all mandates rather than entire states?
On the other hand, changes to the current system would change the campaigning as well. When everything is not decided in 2-3 swing states the candidates should reach out to every voter across the country.
This would pose a problem too. The so-called big tent candidates win on being moderate. In a different system you must stand out and the election could polarise people even more.