Actually I have that problem with the BE. There seem to be several figures that while not as prominent media wise, have some weight inside and still push for those trotskist
I base my relatively good impression on them mostly from the interventions of those you mention, (D.O. and Tavares) but also from João Rodrigues the economist at ladroesdebicicletas.blogspot.com or Pedro Sales, their press guy also present in DO's Blog Arrastao.net.
But these are relatively young elements, and may not yet carry the internal weight that would turn the party to a coherent and sensible leftwing party.
Anyway, i believe they will be the ones to scare the PS from the left, this year.
EU Profiler is an European vote adviser. While for Portugal I got a recomendation of voting BE (I will vote PS), on the European level I was deemed closer to the Dutch PvdA (PES). This I think is a good example of "overton" issues (closer to a marxist party in one country, closer to a social-democratic one in another).
