But in 1991, he was one of the supporters of the commitment of France in the Gulf War, and for this reason he broke definitively with Jean-Pierre Chevenement and Georges Sarre.

In January 2000, Bloche was supported by Daniel Vaillant and Bertrand Delanoë (Chairman of the Socialist Group in the Council of Paris), and he was elected with over 61% of the votes of members to the post of first secretary of the Parti Socialiste Paris federation, where he succeeded Jean-Marie Le Guen, who resigned on 23 November 1999.

Bloche served as a member of parliament for the Socialist Party from 1997, the year of the dissolution of the National Assembly by Jacques Chirac, in the 7th district of Paris (XI e XII arrondissement).

[2] On 13 July 2011 Bloche joined the campaign team of Martine Aubry for the PS primaries, which she lost to François Hollande.

[4] In addition to his committee assignments, Bloche served as vice chairman of the Study Group on the issue of Tibet.