Graduated at "Lucio Manara" Secondary School in Classical Studies in Rome, he attended Law Faculty at LUISS "Guido Carli" University until 1997.

During Spring 2005, he undertook another hunger strike (once more with Rita Bernardini) asking to the Italian public service broadcaster RAI to give more space to the debates on the Radical referendum proposals for partially abrogate the law on artificial insemination, particularly strict in Italy.

During the 5th Congress of the Italian Radicals (held in Padova, 2–5 November 2006), Capezzone has been harshly challenged by many Radical leaders, because of his criticism to the Prodi II Cabinet (mostly stigmatized from Minister of European Politics and International Trade, Emma Bonino) and for an alleged personalistic management of the movement, which allegedly caused a worsening of the economical condition of the party.

After an even more lively Italian Radicals' National Direction meeting held on the night of 4 November 2006, during the 5th Congress of the movement, Capezzone accepted not to offer himself for the fifth time in a row for the Secretariat and to support instead the candidature of the Treasurer Rita Bernardini.

In June 2007, despite not having left the Radicals yet, he launched his own political association, Decide!, mounting rumors that he was heading towards the centre-right House of Freedoms coalition.