The first debate in the left-wing social-democratic primary has generated significant interest in France, with the registration platform Choisir2017.fr reporting its highest single-day sign-up total since its launch. On the day of the debate, 1,300 people registered, compared to 711 on the previous day, according to Patrick Mennucci, president of the organization committee for the primary, which is scheduled for 9–10 and 16–17 October. Mennucci noted that the Socialist Party (PS) and the Republican and Socialist Left (GRS) are receiving additional memberships daily, and the projected number of registered voters—originally estimated at 90,000—may be exceeded. While the figure of 100,000 is being discussed, it has not been officially confirmed. Mennucci urged citizens to participate in the primary, calling it a unique democratic event in France for 2027. For individuals not already members of the participating parties, the cost to vote in the primary is 15 euros, or 10 euros for those eligible for the social rate. At Place Publique, a political organization aligned with the left, membership has grown from 10,000 to 18,000 and could surpass 20,000. The first debate, held on Wednesday evening, attracted an average of 709,000 viewers, with a peak of 953,000 viewers and a 5.5% share of the audience. This indicates strong public engagement with the event. Two more debates are scheduled in the coming weeks. The second will take place on 1 October on France 2 and France Inter, and the third will air on 4 October on BFMTV. These debates will continue to shape the political discourse and influence voter participation. The deadline for registration to vote in the primary is set for 5 October, giving potential participants a final opportunity to sign up before the voting process begins.