Emmanuel Macron and the building of a new liberal-centrist movement

One of the key stories of the French presidential election campaign so far has been the candidacy of Emmanuel Macron, who is currently challenging Marine Le Pen and François Fillon for a place in the second round. Susan Milner assesses his campaign, arguing that his chances of success will depend to a large extent on how wide he can keep the centre ground under attacks from the French centre-left and centre-right.