To me, this sort of win, the power that it gives them to promote and further the gains that they stand for is likely to have a MUCH bigger impact on the actual lives of their constituents than all the Occupy movements put together.
You know, around 1980 the green party formed in Germany. One of their main program points was a dedication to peace. In 1998 the came into power together with the SPD, supposedly a left wing party. The first action of the time of this government was to get into the war with Yugoslavia. Instead of standing by their principle to purse peaceful solutions (especially in light of that most of the reasons given for the war were outright lies comparable to the WDMs to be found in Iraq) the leaders of their party clang to the power they just got and apart from a lot of people leaving the party because of this not much happened.
What one can learn from this kind of electing representatives is that since they get the full power to decide and are not bound by the resolutions of the people/party they represent, one can hardly expect that they do what they promise before the elections. Considering that it needs a certain kind of character to get to the top of the ladder to come into a position of power it would actually be surprising if it would be otherwise. Power corrupts.
Currently, the PP has, what they call fluid democracy and the hierarchy is very shallow, The question is, whether they can keep this structure up, or whether they will become an established party like the Green Party, The latter needed only 20 years to arrive in the "system".
Given these circumstances, one should not underestimate the pressure from the street that comes from the likes of the Occupy Movement. Is is a very important factor, especially between elections when the only power the people have is the direct action on the streets.