After Brexit, is a Frexit possible?

The decision by the United Kingdom to leave the European Union has upended France's political scene. All the major players for next year's French presidential elections are scrambling to find the best response to the shockwave from across the Channel. President François Hollande is lagging far behind in the polls but hoping he can seize the opportunity to regain some momentum. But others are predicting that Brexit could boost extreme parties surfing on an anti-European, anti-elite sentiment.