2018 Haute-Garonne's 8th constituency by-election

[5] Michel Montsarrat, a former rugby player for AS Béziers Hérault,[1] later a restaurateur,[6] and hotel manager living in Luchon, was once again invested as a candidate of La République En Marche!, supported by the nine deputies of the presidential party in the department.

[18] Local elected supporters, including deputy Mickaël Nogal and mayor of Rieumes Jennifer Courtois-Périssé, attended a public meeting with Montsarrat on 23 February.

[24] Aviragnet held another public meeting with Delga and Méric on 14 March,[25] and received the support of the French Communist Party (PCF) in the second round,[26] as well as that of Génération.s, the movement of Benoît Hamon.

Though Jennifer Courtois-Périssé, regional councillor and mayor of Rieumes, was considered the natural candidate in the constituency, she left the party to join La République En Marche!, in which she held a national leadership position.

However, recently elected president of the party Laurent Wauquiez made clear his desire to present a candidate in the constituency,[33] and his entourage sought to bypass the regional federation in the investiture process.

[7] Corinne Marquerie, a retired educator,[6] also returned as the candidate of the PCF,[38] and was joined by Member of the European Parliament Marie-Pierre Vieu at a public meeting on 1 March.

[41] Mayor of Ore Hervé Minec stood as the candidate of the Popular Republican Union (UPR),[42] with party president François Asselineau visiting in support.

A member of the party's federal council and regional executive office, she received the support of Julien Bayou, national spokesman for the EELV, in a visit to the constituency on 1 March.

[46] He ultimately declined, and indicated that while he was open to the idea, he believed that the proposal was not made in good faith, viewing the exclusion of the PS candidate as an effort to claim the flag of the "true anti-Macron opposition".

[47] On 14 March, 100% Radio, ViàOccitanie, and La Dépêche du Midi hosted a debate moderated by Olivier Roirand and Brice Vidal between Aviragnet and Montsarrat from 19:00 to 20:00 CET.

First round results by commune
Second round results by commune