Partido Progresista

Marco Enríquez-Ominami is creating a new party, the Partido Progresista (Progressive Party, or PRO, a name chosen through an internet poll, thus showing how he is closer to "the people") and will start obtaining signatures on June 1 (according to the Organic Law of Political Parties, he will have 210 days to obtain 0.5% of the total number of people who voted in each congressional district in the last election for Diputados).

On his website, he is looking to establish foreign policy credentials through discussions with Mexican officials, among other things.  I don't know how much anyone buys that, but with the Concertación chewing itself, there is definitely a gap for him to fill.