“This result expresses something strong: that a left that is faithful to its values can unite, govern and win,” the MEP wrote online.
“We are here to win the presidential election: Turn the page on Macronism, stop the far right and change our lives,” he added.
But Glucksmann, a staunch supporter of Ukraine and a critic of China, now faces a much greater challenge: how to beat the far-left leader Jean-Luc Mélenchon. The head of the France Unbowed party is surging in the polls, with the latest Ifop survey giving him 14% to 17% support, compared to 11% for Glucksmann.
In recent weeks, Glucksmann campaigned against forming an alliance with the far-left leader.
Three other candidates ran in the primary, including former minister Ségolène Royal and lawmakers Jérôme Guedj and Emmanuel Maurel.
Some 140,000 people were registered to vote in the primary — including, 80,000 who paid €15 to take part but weren’t members of any of the parties whose candidates were running — raising uncertainty over the outcome.
The online voting platform was also targeted by a cyberattack shortly after opening, organizers said in a statement on Friday, but “was never disrupted” and “the integrity of the recorded votes has not been compromised.”