This study examines the discourse of Beppe Grillo, founder of the Five Star Movement, a populist political movement created on his personal blog in 2009. It analyzes three of the texts published on Grillo’s blog about the constitutional referendum proposed by the ex-Prime Minister Matteo Renzi in 2016 by applying various linguistic models from the field of Critical Discourse Analysis to demonstrate some of the most salient linguistic patterns that coincide with characteristics commonly found in populist discourse. By examining the socio-political background of the movement, this study also aims to reveal the significance of the blog as a tool in the success of their campaign against the referendum. We seek to place Grillo’s discourse within the realm of populist discourse by observing how he utilizes the referendum to promote his movement and challenge the established parties of Italy.