Marine Le Pen
This has been first documented in the book "Plaidoyer pour une gauche populaire" by think-tank Terra-Nova which had a major influence on all contestants in the presidential election (and at least, Sarkozy, François Hollande, and Marine Le Pen). This electorate voted overwhelmingly in favor of Marine Le Pen and Sarkozy while the city centers and close suburbs voted overwhelmingly for François Hollande.