On France2 last night, Marine Le Pen told David Pujadas that she was having trouble collecting the 750 official signatures needed to secure a place on the presidential ballot. She maintained her position despite Pujadas' open skepticism.
One doesn't have to believe in a conspiracy mounted by the Élysée to think that Le Pen might have difficulty collecting signatures. Many a mayor might have perfectly conscientious reasons for refusing to further an FN candidacy. But if the result is to exclude MLP from the ballot, the very legitimacy of the election will be at stake, because the FN candidate is expected to receive around 20% of the first-round vote. You can't exclude 20% of the electorate and call an election legitimate.
In a related vein, there is a report from Thierry Desjardins that Dominique de Villepin has thrown the Élysée into a tizzy by registering at 8% in private polling. This would of course ensure Sarkozy's defeat, as Villepin would likely siphon off old Gaullist and Chiraquien elements of the UMP whose support Sarkozy absolutely requires. What to do? Try to prevent him from gathering enough signatures? Desjardins suggests that such a move is underway. De bonne guerre? Not really. In the end, it may be Villepin who hangs Sarko from a butcher's hook rather than the other way around.