Archie Brown has written an article for BBC News online (13 February) on the 'darkening cloud' looming over mainstream European politicians in the early months of 2015.
He writes, "It is the rise of parties and movements seen by them as either extreme or nationalist, sometimes both.
That these relative newcomers have become major players in national politics is viewed not only as a dangerous departure from the natural political order but also a serious threat to the territorial integrity of the state."