Const. reform referendum campaign (2)

(ANSA) - Rome, April 14 - Premier Matteo Renzi said Thursday the campaign for an October referendum ratifying the abolition of the Senate in a landmark constitutional reform would be "very tough, given what's at stake". He said he was prepared to use the "most effective arguments" in favour of the reform to streamline Italy's costly and unwieldy political machinery. Renzi has staked his political future on the referendum.