I didn't sense an ideological shift.
The problem (if problem there is) lies in its divisions.
I think the French PS seems to have an image problem: it's perceived as lackluster and lacking in ideas -- and has no charismatic leader.
It needs its own Obama.
But then what do I know?
Are you equalling hard left would-be radicals like Besancenot or Mélanchon to the traditionnal left like the PS?
Because it seems to me that there are more difference on the european topic between thses than between PS and the UMP (right): Both Mélanchon and Besancenot voted against the constitution treaty, whereas the PS voted YES.
I'm all in favour of division here, because such a difference on such an important issue cannot be hidden easily. (and should not) A free fox in a free henhouse!
(h/t to Migeru)
