More on the binomial system

Mariano Montes at Artepolítica has a good discussion of the binomial electoral system in Chile (it is in Spanish). He is optimistic about its reform, since the Concertación has always pushed to eliminate it and Sebastián Piñera has publicly called for the same.  I would also add that Piñera is in a very strong political position at the moment, so it is entirely possible--though by no means guaranteed--that we could see a change.