Infighting among France's centrist presidential hopefuls is fragmenting the mainstream vote and increasing the prospect of a second-round contest between far-right Marine Le Pen and hard-left Jean-Luc Melenchon. Polls before next April's election show Le Pen nearly certain to reach the May runoff, while Melenchon has repeatedly moved ahead of mainstream contenders. Edouard Philippe, President Emmanuel Macron's former prime minister, has been the leading centrist but has suffered from a weak campaign, voter fatigue after Macron's two terms, a difficult social and security environment and challenges from Gabriel Attal. An IFOP-Fiducial poll for Le Figaro put Philippe at 15%, down six points since September, compared with 16.5% for Melenchon and 13% for Attal. The fragmentation also includes centre-left candidate Raphael Glucksmann, who gained ground after winning the Socialist primary, and right-wing contenders Bruno Retailleau and David Lisnard. Macron allies are urging moderates to unite, warning that continued division could produce an RN-LFI runoff.