She is the current leader of the French National Front and therefore not eternal. The party she leads has been around much longer than her, and suffice it say, "cleaning up" party membership (which is questionable in and of itself) to oust the more extreme elements to suit one's political ambitions is only a means to an end to gain wider support among the larger voting public. There are still many within her party who are just waiting for the opportunity to replace her with a more traditional National Front view, one which harks back to the days of her father, and is even more rightwards-leaning on the political spectrum than today's current, much like any other political party with its various sub-currents. At the moment, she is treading a thin line politically, and I suspect that if needs must, she would necessarily veer to the right in order to keep her position as head of the party once in power. The concern for the French is that, as Véronique rightly pointed out, many French people still living today have the memory of what the occupation was like, and what various collaborators of that regime did to aid and abet the regime in place at the time, including rounding people up or denouncing them to the authorities simply based on the particular faith to which they adhered, at odds with the political power in place at the time. The thought of such a similar regime being able to insinuate its way into daily life once again is anathema to them. Whilst Being British might not mean we would be an immediate target, it is probably safe to say that it won't save us from the long-term politics her party espouses - it will only be a matter of time before rules start being changed which will begin to affect our lives too, especially if, as she has vowed, she takes France out of the EU. To that extent, I can understand why some Brits might feel like leaving France is an appropriate response were she to be elected - after all, why live in a country where one feels that persecution, perceived or real, is either only just around the corner, or already here. I suspect that on a personal level, I too, would have some qualms about such a situation. I don't get that feeling with French centrist politics, a degree of cynicism certainly, and the "same old, same old" weariness, but not apprehension of what unpleasant fodder is likely to be coming down the funnel at some time in the near future.