 Moreover, Renzi had hired American political adviser Jim Messina, who had previously managed Barack Obama's presidential campaigns, to oversee the campaign for "Yes".On 24 May 2016, 193 university professors published a manifesto on "L'Unità" (the official newspaper of the Democratic Party), in which they expressed their support to the constitutional reform.Notable signatories were Franco Bassanini and Guido Tabellini.