Polls show far-left Melenchon closing in on the frontrunners, 39-year-old centrist Emmanuel Macron and far-right leader Marine Le Pen ahead of the April 23 vote, adding new drama to a rollercoaster campaign.
After strong performances in two televised debates, several new surveys this weekend showed him climbing to third position, with 18-19 per cent of voters saying they would vote for him.
Speaking in southern Marseille, he said voters had a choice other than the extreme-right "condemning our great multi-coloured people to hate itself" and fans of the free-market that "transforms suffering, misery and abandonment into gold and money."
Analysts say forecasting the French two-stage election is even more difficult than usual, with an unusually high number of voters saying they do not plan to cast their ballots, or have not made up their minds.
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Elsewhere today, scandal-hit rightwinger Francois Fillon held one of his biggest rallies so far, gathering thousands of flag-waving supporters at a conference hall in southern Paris.
The 61-year-old ex-prime minister is desperate to pick up momentum heading into the closing fortnight after a campaign dominated by allegations that he paid his wife hundreds of thousands of euros for a fake job in parliament.
During the meeting, Fillon kept up his attacks on election favourite Macron, painting him as the continuation of unpopular Socialist President Francois Hollande, whom Macron served for four years as advisor then as economy minister.
"France would be the big loser: another five years of half-measures, another five years of missed opportunities," he said to cheers.
While Melenchon and Fillon gathered supporters, Macron and Le Pen were happy to spend time giving interviews.
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