Forza Italia and its supporters argue that the immunity bill for top state officials was long overdue and brought Italy's legislation into line with other European countries.
"Roll on the referendum. All Di Pietro's efforts will serve to prove this point," he said.
The Italian left, usually quick to bash Berlusconi when the opportunity arises, is lukewarm about the proposed referendum, many having decided in June that immunity for "Il Cavaliere," as Berlusconi is known, was better than a constitutional crisis should he be found guilty while still in office.
Di Pietro says left-wing leaders have asked him directly to stop and the Italian media have hardly covered the progress of his campaign this summer, meaning many Italians do not know a referendum is in the offing.
"We are making everyone uncomfortable," he said. "When they saw us popping up with our stands and our megaphones, it made their stomachs turn."
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