Also to note, a lot of Le Pen's support is due to her associating the usual xenophobe anti-immigration rhetoric, to a kind of left-wing populist position (anti-globalization, anti-corporations, etc...). It's certainly playing a "the left has betrayed the working class" game, which works well in France since the 1980. So, in some way, a lot of her voters can be considered "left-wing".
This is an interesting realignment and one that could cause issues for the traditional left going forward. There are some synergies between the xenophobic right and the populist left, much to the consternation of the philosophical/elite lefties. Seems to be cropping up elsewhere: Hillary Clinton's campaign in 2008 dabbled at the edges of that, in opposition to Obama's more esoteric/urbane leftism. Some of the Democratic Party's anti-China rhetoric seems to go in that direction as well, and lines up with some of the trade policies they espouse (e.g., pro-labor rules).
Certainly not trying to compare Hillary to Marine, but there's a common thread in there somewhere. It'll be curious to see how the parties migrate over the next decade.
