Gamba was a member of the Milwaukie Planning Commission and served as Vice Chair of the Subcommittee on Energy and Environment of the League of Oregon Cities.

[6] In 2020, Gamba announced his intent to run for the Democratic nomination for United States House of Representatives in Oregon's 5th congressional district.

Gamba, a progressive, noted his concerns with Schrader's moderate and sometimes conservative stances on various issues, namely his support for gun rights,[7][8] "A-" rating from the NRA Political Victory Fund,[9] and opposition to the Green New Deal and Medicare for All Act.

In 2022, Gamba announced his intention to run for the Oregon House of Representatives in District 41 after incumbent Karin Power decided to resign to focus on her main job.

Gamba ran against nonprofit executive Kaliko Castille and former transit operator Christopher Draus in the primary, easily defeating them both.