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By Michel Rose PARIS (Reuters) - French Economy Minister Emmanuel Macron launched what he called a "Great March" on Saturday, a door-to-door campaign across France to collect voters' grievances ahead of 2017 presidential elections, in a new sign of his political ambitions. Some 60 teams of 10-40 volunteers will knock on voters' doors in about 50 cities across France, asking questions such as "What do you think doesn't work in France?", a spokeswoman for "En Marche" party told Reuters. Macron unveiled his movement in April, saying he wants it to be neither of the left nor the right.