A Socialist French President means France will leave euro with Greece, Spain and Portugal. No more euro means no more EU. When that happens Eurosceptics can say "We told you so."
LibLabCon will then say:
"So you did, but you are racist, so we will just have a referendum, get us out and give you no credit. We can do this because everyone hates you because you are nasty, stupid and lower class. If you had got that Claire Khaw to lead your party and became civic nationalist we wouldn't be able to call your racist, but with Nick Griffin as your leader you are still the same bunch of despised racist failures. Now fuck off."