The Centro de Estudio Públicos poll just came out, with lots of information on education. Since students were out in force, as were the police in response, this was not a pleasant irony for Sebastián Piñera (check out some images here). The CEP poll shows his presidential approval at 26 percent, with little confidence in how he is handling, well, most anything.
An interesting point to keep in mind, though, is that for years approval of handling the economy trends very closely to presidential approval. Irrespective of the education protests, Piñera has a shot at recovery if he can turn around perceptions about how he is handling the economy.
Update: Wow, how does Piñera respond? By saying, "Remember the miners!!"