[2] During 2010s he became a close advisor of Matteo Renzi, former mayor of Florence and Prime Minister of Italy from 2014 to 2016.

In 2017 Renzi appointed Richetti spokesman of the Democratic Party.

[3] On 8 April 2018, Richetti launched his reformist faction Harambee and announced his intention to run as next secretary of the Democratic Party.

[4][5] On 10 September 2019, Richetti announced his abstention regarding the investiture vote of the new government between PD and the Five Star Movement, and his subsequent exit from the party.

[6] On the same day, he stated that he would join Carlo Calenda's movement, Action.