I met one of their senators during the ESF meeting in Athens. I was impressed: they're realist without being "sold-out", rather skeptical of the EU, but in a reasonable way, and really are a party of what is traditionally considered the Left. Plus they seem to have a grasp of issues that usually transcends that of the rest of the European Left  They're associated with but not members of the European Left party. Their web magazine Spectrezine is excellent and so is its blog.

BTW what are the actual vote percentages?

The road of excess leads to the palace of wisdom - William Blake