The fact is that the MSM are often favourable to the right anywhere, because one of the defining characteristics of what we call "the right" in political party terms is that it is there to defend money, property, business. But there's a particular set of youngish (at least, not-so-old) media bosses who are part of Sarko's personal circle. There are not many French media pies they haven't got their fingers in.
i do not see that especially with a ridiculous 96% of the journalists voting left (Poll from Marianne few years ago)
Your sourcing is vague. 96% is indeed ridiculous. But even if a majority of journalists "vote left", tell me where the left-wing media are.