Bibulus stood in 60 for the consulship of 59 BC. it was well known by this point that Caesar would almost certainly be one of the victors. Caesar campaigned with a
Lucius Lucceius, who bankrolled huge sums spent to buy votes. With substantial effort, including bribes of their own and more licit canvassing, Bibulus and his faction were able to have him returned as Caesar's colleague. His presence as consul was expected to counterbalance Caesar with his consular veto. The creation of the so-called
First Triumvirate between Caesar,
Pompey, and
Crassus in the aftermath of the elections also led to a reorganisation of Roman politics to counterbalance the powerful new alliance around Caesar. Bibulus took a leading role in this conflict. When Caesar started the year bringing a promised agrarian bill which would settle urban Romans and veterans on lands to be purchased by the state for distribution. Opposition centred mainly not on the ends they sought but rather the popularity and prestige which they, and especially Caesar as consul, would accrue from passage. Nor did the opposition necessarily have a majority in the senate – also having the support of Pompey and Crassus as influential former consuls] – but Cato's filibuster forestalled a vote. At a public meeting () presenting the bill, Caesar summoned Bibulus to offer his own reasons to object. He gave none, exclaiming only that he would not permit any reforms during his consulship and that he would not permit even a unanimous people to enact the bill. When Caesar moved a vote on the bill anyway, Bibulus and three allied tribunes came to the Forum: Bibulus sought to obnuntiate the proceedings, making them religiously invalid, and the tribunes sought to exercise their vetos. However, Bibulus and his friends were attacked by the crowd as they voiced their opposition, driving them from the Forum, with his broken to symbolise the crowd's repudiation of his magistracy. In their forceful absence, the law was then passed. The next day Bibulus summoned the Senate to meet and asked it to annul the law, arguing it had been carried by violence () and contrary to the auspices. However, the Senate refused to do so, either because it believed the law to be legitimately an expression of the people or because it was intimidated by Caesar's mobs. Further legislation was then brought at Pompey's insistence, probably in May, to distribute the lands around
Campania secured during the
Second Punic War and hitherto untouched. The opposition to Caesar, at an ebb, changed tact. Instead of opposing Caesar directly, Bibulus conspicuously shut himself in his house, claiming that Caesar was threatening his life. While shut in his house, Bibulus also issued edicts attacking Caesar and messages announcing bad omens to throw up procedural objections to Caesar's continued legislation. This strategy of boycott over the year greatly eroded the popularity of the three allies, presenting Caesar as a tyrannical figure unchecked by his colleague. Indeed it also expanded, with three other tribunes and some senators joining in the boycott, all signalling that Caesar and his allies' tactics were trampling on the dignity and liberty embodied in the people's other magistrates. The
Vettius affair in mid-summer saw an informant named Lucius Vettius accuse Bibulus and other men associated with him of a plot to kill Caesar and Pompey. The veracity of this plot is dubious, not only because Vettius' story changed in his two tellings, but also due to Bibulus' role in producing the informant. Regardless Vettius died shortly thereafter, after changing the target of his accusations, amid rumours of murder. The senate, showing more independence than Bibulus and his allies signalled by their boycott, debated the matter soberly rather than seizing on it as pretext for a witch-hunt. Also in the summer, Bibulus by edict ordered the consular elections delayed until October, which has been suggested as a ploy to reduce turnout among the poor. Caesar's effort to protest this edict before Bibulus' house, however, found few supporters, further suggesting dissatisfaction with Caesar's political position. Caesar also brought a law to rein in provincial extortion and corruption, the , which passed likely with the support of Cato and Bibulus' faction. Although the elections fell within Bibulus' turn to hold , he did not depart his house to hold them. Instead, Caesar held the elections in accordance with Bibulus' edict that October. Caesar's father-in-law
Lucius Calpurnius Piso and Pompey's former legate
Aulus Gabinius were returned as consuls; Bibulus' friend Lucius Domitius Ahenobarbus was returned as one of the praetors. At the end of the year, he was barred by one of the new plebeian tribunes,
Publius Clodius Pulcher, from delivering his valedictory speech. ==Senator and governor==