The Front National was once regarded as a marginal, extremist political party, but economic turmoil in Europe has thrust it into the mainstream of French Politics. Charismatic leader, Marine le Pen, helped secure a historic victory for the party in the European Elections, and now has her sights set on the Elysee Palace. In a series of interviews for Our World, conducted before and after the terrorist attacks in Paris, Robert Peston tries to understand what's behind her extraordinary rise, and asks if she could really be president?