Is that how it works though? You just get enough people to vote for a suitably left wing party and things change?
I'm just trying to think through how that's meant to work in the context of the example I mentioned a couple of pages back, where you've elected some councillors and they have to decide whether to try to get the least-worst compromise on an austerity budget or dig in for a proper fight with central government by refusing to pass a budget, with all the risks to services that that entails.
It seems to me that for the second option to be realistic you need something better than a bunch of disillusioned floating voters who've drifted away from the Lib-Dems or nuLabour.
You need committed support from a section of the community with a clear view of where their interests lie, how picking that fight is going to further them, what's at stake and what the risks are etc.