The Commentariolum petitionis written in 64 B.C. is the oldest campaign strategy document that has been preserved for us. In this handbook Quintus Tullius Cicero, younger brother of the most excellent orator of the Antiquity, Marcus Tullius Cicero, gives advice to his elder brother on how Marcus can win consul’s elections, that is, how he can rise to the highest position of the Roman Republic. In the present paper Commentariolum will be analysed in detail examining the following aspects: the Antique genre commentary (I.); the issue of authorship of Commentariolum (II.); the characterisation of the competitors, Antonius and Catilina, provided in Commentariolum (III.); the system of elections in Anciet Rome and the crime of election fraud/bribery, i.e. the crimen ambitus (IV.) and the role of associations and clients in Roman elections (V.).