District Attorney, Bristol District
September 1, 2026 · Bristol County, Massachusetts · County · primary
How do we calculate vote impact?
Vote impact = representation (how much weight one vote carries here, the smaller the district's population, the higher the representation) + decisiveness (how likely this race is to be close, based on past results and number of candidates).
Representation: Low · 21 out of 100
This district is large for its type, so each vote is a smaller slice of the outcome. About 582,270 people live here.
score = 100 × ln(largest population ÷ this district's) ÷ ln(largest ÷ smallest), rounded to 2 decimals = 100 × ln(1,638,365 ÷ 582,270) ÷ ln(1,638,365 ÷ 14,483) = 21.88, comparing counties in MA (grades: 66+ high, 33+ average, otherwise low)
Decisiveness: Unknown
No past results for this contest yet.
Low representation + unknown decisiveness → Below average vote impact.
Some data is missing, so this rating is based on partial information and capped at "High".
District Attorney is responsible for:
- Deciding who gets charged with crimes in the county
- Prosecuting criminal cases in court on the public's behalf
- Deciding plea deals and what sentences to ask for
- Working with police as cases are investigated and built
Affected Areas: Anti-Corruption, Public Safety and Crime Control, Gun Control, Women's Reproductive Rights, Civil Rights, Corporate Accountability
Candidates
Christopher Matthew Markey
Democratic · declared
Christopher Matthew Markey is the Democratic candidate for the open Bristol District Attorney office in 2026. He has represented the 9th Bristol District in the Massachusetts House since 2011. His legal career includes victim-witness advocacy, assistant-district-attorney and supervising-prosecutor work, major-crime prosecutions, appellate arguments, and private practice.
Seth Thomas Aitken
Republican · declared
Seth Thomas Aitken is the Republican candidate for the open Bristol District Attorney office in 2026. He is a practicing criminal and civil attorney and formerly served as a Bristol County prosecutor, prosecutor supervisor, law-school instructor, Fall River assistant corporation counsel, and Fall River city administrator. He also served eight years as an Army officer.
Election sources
Source: sec.state.ma.us
Source: sec.state.ma.us