Berlusconi called for centre-right voters to rally behind the re-launched Forza Italia party.
Silvio Berlusconi is appealing a jail sentence and ban from public office for tax fraud.
Prime Minister Enrico Letta promised to press for a change to the European Union's focus on austerity.
Parliament failed to elect a new state president in the first two votes on Thursday.
The only man with the key to Italy’s crisis Giorgio Napolitano has only weeks left in his job.
Silvio Berlusconi wants the centre-left to go into coalition with his centre-right group.