The media will portray them as far right wing and soon enough as poll numbers keep climbing for them soon a "breaking story" about they are anti Semitic
There had been many racist and antisemitic statements from the National Front, one more wouldn't make a big difference unless it's even more shocking.
The media can't "protray them as far right wing" because they ARE far right. Your statement proves that you don't know what you are talking about.
The National Front was born from Ordre Nouveau (New Order, fascist/neofascist), and inspired by Italian fascist MSI of which they copied the symbol:
http://grenoble.indymedia.org/IMG/jpg/Logo-MSI-FN-2.jpgSome members of the National Front, such as Bruno Gollnish, who is on the right wing of the party, a close friend of Jean-Marie Le Pen, is also quite close to Allessandra Mussolini herself.
So the National Front can ba called fascist, neofascist, post-fascist, whatever you want, but just "far-right" isn't enough. That's not debatable.
Please remember that the FN doesn't just draw right-wing voters, but appeals to a large group of PS-voters as well. Which is why, just because the PS-candidates withrew their candidicacy, it doesn's automatically mean that the Coalition of the Right-candidates will gain all PS-votes. Some will stay home, some will vote CR, some will vote FN. Nothing is sure until the 13th.
Those who still vote PS despite the context can be considered loyal "socialists" (let's make it clear for the Anglo-saxons: a "socialist" in France isn't what you would call socialist in your countries) and those people wouldn't vote for the National Front.
Let's not forget that the turnout was only around 50%, which means than more than half of the population didn't vote. So, it's very likely, and rather confirmed by the polls, that many left-wing people didn't vote as they were disappointed by Mr Hollande. On the other side, people supporting the National Front were very much mobilized.
Moreover, many of the young people who voted also favoured the National Front. Those ones probably never voted for the Socialist Party.
So I doubt that we can say that a "large group of PS voters" voted for the National Front. Actually, we have much more reasons to believe that many supporters of the UMP/Les Républicains shifted to the far right, which explains the rather bad result of the formers.