Elected deputy, he was fielded by the left-wing of the PPI as a candidate for the party secretariat on the occasion of the first congress in July 1994 as an alternative to the candidacy of Rocco Buttiglione.

At the congress he presented a program with a strong reformist connotation, indicating for the PPI the path of an alternative to Silvio Berlusconi with the possibility of center-left alliances.

In the spring of 1995 he was at the forefront, as party president, in the dispute against Buttiglione who deployed the PPI in the centre-right with Silvio Berlusconi, without consulting the National Council.

The dispute led to the division of the party: the majority of Bianchi and Bianco chose the center-left alliance and kept the name of PPI, the minority kept the symbol of the crusader shield, allied itself with the centre-right and acquired the name of United Christian Democrats.

He was the regent commissioner of the city coordination of Sesto San Giovanni of The Daisy, while from 24 November 2007 he was the first provincial secretary of Milan of the Democratic Party.