I would argue that the USA suffers from its bipartisan system in a lot of ways; among them the problem of two parties having to span an incredibly wide range of political positions that are often so far apart to be almost irreconcilable. I'm pretty sure you will find some people with uncomfortable positions at the fringe seams of the Left Alliance as well, they are just organised in a very different system compared to the US and do not have the momentum to rally around these positions right now.