Carcetti continues his campaign, with D'Agostino serving as his strategist while Norman Wilson, a former editor at The Baltimore Sun, becomes his campaign manager. When early polls show low numbers for Carcetti, he assumes that he has already lost on the basis of his race and begins to lose interest in the campaign. He chooses not to prepare for an upcoming debate with Royce and Gray, believing that he could win the debate but still lose the election regardless.
However, Carcetti's debate performance is invigorated when he learns from Valchek that a state's witness was recently murdered. He uses this inside information and his previous request for a witness protection scheme to ambush Royce to great effect. Carcetti persuades Gray to publicly criticize Royce with the promise of a prominent council position in exchange for taking a large share of the African-American vote.
His confidence restored, Carcetti hits the campaign trail with renewed vigor, receiving assistance from State Delegate Odell Watkins, who has turned against Royce. Thanks to his alliance with Watkins, Carcetti defeats Royce in a close Democratic primary election. In a city with a 9 to 1 Democratic advantage, Carcetti easily defeats a Republican named Crawford in the general election with 81% of the vote.
As mayor-elect, Carcetti immediately makes changes before his inauguration. After discussions with city officials, he decides to replace Burrell as BPD commissioner, planning to attract outside candidates while asking Burrell to resign. Burrell quickly realizes what is happening and rallies support from City Council President Nerese Campbell, corrupt State Senator Clay Davis, and a group of influential black ministers. Burrell orders an increase in arrests at Davis' suggestion, hoping to prove that the BPD is functioning well under his leadership. A frustrated Carcetti restricts Burrell's authority and insists that he clear his orders through Deputy Commissioner William Rawls.
Major Cedric Daniels, a politically neutral African-American district commander, impresses Carcetti with his interest in securing quality felony arrests instead of statistically based reductions in crime. Carcetti offers Daniels a promotion to the Criminal Investigations Division and an automatic promotion to the rank of colonel. Through Daniels, Carcetti learns of Burrell's arrest hike and consequently orders the BPD to reform its approach by prioritizing quality felony cases over statistical quotas.
Carcetti's plans for the BPD are derailed when he learns that Baltimore's schools face a $54 million budget deficit. He and Wilson travel to Annapolis in order to convince the governor to bail out the schools. The governor agrees on the condition that Carcetti face public humiliation by publicly admitting to eliciting his aid. Carcetti rejects the offer, as it would be damaging to his own planned campaign for governor; Wilson is left disappointed at Carcetti's decision to put his ambition ahead of the needs of the city. Carcetti justifies his decision by saying that he would be in a better place to help the city schools as governor.