He has been described as "earnest and somewhat plodding". He served as curule aedile alongside Julius Caesar in 65 BC. Two curule aediles were appointed each year and they were responsible for maintenance of public buildings (aedēs) and the regulation of public festivals. They also had powers to enforce public order. Caesar overshadowed Bibulus throughout his year in office, particularly in the provision of the ludi Romani, a religious festival involving multiple ceremonies and secular entertainments. He again served alongside Caesar in 62 BC when both were elected praetors, judicial magisterial positions. Bibulus opposed Caesar at every opportunity. Shortly before they took office Rome was racked by the Catilinarian conspiracy, an attempt by a number of senior aristocrats to overthrow the Republic. During his term in office, Bibulus was called upon to suppress supporters of the Catiline rebellion among the Paeligni, an Italic confederation from what is now Abruzzo.