Incumbent District 3 Council Maureen Feeney declined to run for reelection, and a large field of candidates ran to replace her.

He is vice chair of the Planning, Development and Transportation Committee as well as a member of the committees on Census and Redistricting, City, Neighborhood Services and Veterans Affairs, Government Operations, Homelessness, Mental Health and Recovery, Housing and Community Development, and Ways and Means.

[7][8] In 2023, Baker and Erin Murphy were the only two City Council members to vote against advancing a home rule petition asking the state to allow the city to implement proposals by Mayor Michelle Wu to reform the Boston Planning & Development Agency and to enact a form of rent control.

[9] Baker was one of four Boston City Councilors that voted against the council's redistricting map that was approved after the 2020 United States Census.

Baker took particular issue with the map's separation of precincts around Dorchester's Adams Village business area into different city council districts.

[10] The map that Baker was against was ultimately prohibited by preliminary injunction from being used in the 2023 Boston City Council election after a ruling by Federal Judge Patti Saris.