Has the Front National benefited electorally from Brexit? It is, of course, too early to say for certain. If Britain thrives outside the European Union, then it might make a vote for the Front National seem less like a leap into the unknown.
During the Brexit referendum, the UK was often called the “canary in the coal mine” (including by Nigel Farage, leader of the UK Independence Party). That’s potentially quite a scary place to be for the canary, but eurosceptics in other countries will be watching what happens carefully.
The recent terror attack in Nice, in which a Tunisian man drove a truck into a crowd and killed 84 people, could also sway some French voters. Europe, security, and immigration are all issues that the Front National puts front-and-centre in its campaign strategy.