James Traub has a good article on Mélenchon in Foreign Policy, painting him as the candidate of romantic revolutionary nostalgia.
What has happened to Hamon is a pity. After delivering the best speech of his life and perhaps the best speech of this campaign, he had a lackluster debate performance and began to sink in the polls. Mélenchon now seems likely to finish ahead of him. But there is much more to build on in Hamon's version of ecosocialism, for all its flaws, than in Mélenchon's.