The room spilled over with foreign reporters curious to see Romano Prodi up close, and one went so far as to refer to him as the “probable” next leader of Italy. “Possible,” Mr. Prodi quickly corrected — and thus in one characteristically precise word summed up the campaign leading to the election on April 9 and 10, which has pitted the irrefutably unexciting Mr. Prodi against the least predictable of politicians, Silvio Berlusconi, for five years Italy’s prime minister. Ful l Story