PARIS — French hard-left leader Jean-Luc Mélenchon is trying to use his head start in the race for president to outflank his left-wing rivals. Since announcing his bid on Sunday , the 74-year-old anticapitalist and his allies from his party, France Unbowed, have flooded the airwaves and social media with a simple pitch for what will likely be his final bid for the Elysée. “We have a team, a plan and only one candidate,” Mélenchon, who came a whisker away from advancing to the runoff in the last