Massachusetts Senate Voting Record: What 2026 Candidates' Roll-Call History Reveals

The Massachusetts Senate Field: A Party-Diverse Research Universe

The 2026 Massachusetts Senate race draws a wide field of 52 tracked candidates across two race categories, with a party mix of 8 Republicans, 33 Democrats, and 11 other-party contenders. This diversity means that a single roll-call analysis cannot rely on a uniform voting record. Instead, researchers must segment candidates by the chambers they served in—or whether they hold any legislative record at all. OppIntell's source-backed profile signals show that all 52 candidates have at least one source-backed claim, with an average of 1,390 claims per candidate. That figure, however, masks wide variation: top-researched candidates like Seth Moulton and William R. Keating carry deep records, while lesser-known contenders may have only a handful of public votes to examine. For campaigns preparing for primary or general election opposition research, this asymmetry creates both opportunity and risk. A well-sourced opponent could surface a decade of floor votes on taxes, healthcare, or judiciary confirmations, while a thinly sourced candidate may force researchers to rely on campaign statements, interviews, or local coverage instead of legislative roll calls.

What Public Voting Records Exist for Massachusetts Senate Candidates

Massachusetts Senate candidates come from a mix of federal and state legislative backgrounds. For those who served in the U.S. House—like Seth Moulton (MA-06) and William R. Keating (MA-09)—public voting records are extensive, covering hundreds of roll-call votes on major legislation. For state legislators, the Massachusetts General Court provides recorded votes on bills, but the depth and accessibility vary by session and issue. OppIntell's research methodology prioritizes source-backed claims: each candidate's profile is built from FEC filings, Wikidata, Ballotpedia, and official legislative websites. Of the 52 tracked candidates, 20 are cross-platform-verified across FEC, Wikidata, and Ballotpedia, giving researchers a solid foundation for vote analysis. The remaining 32 candidates may have gaps—especially those who have never held elected office. For these candidates, public voting records do not exist, so researchers would examine other signals: public statements, questionnaire responses, or past campaign platforms. Campaigns should note that a lack of voting record is itself a research finding; opponents could frame it as a lack of experience or accountability.

Party Comparison: How Republican, Democratic, and Other Candidates Differ in Vote Availability

The party breakdown of the Massachusetts Senate field—8 Republicans, 33 Democrats, and 11 other-party candidates—creates distinct research profiles. Democratic candidates dominate the field and include many incumbents or former officeholders with long voting histories. For example, Seth Moulton's record in the U.S. House covers votes on defense authorization, climate policy, and impeachment proceedings. Republican candidates, by contrast, are fewer and often come from local or state offices, yielding a thinner set of public votes. The 11 other-party candidates—including Libertarians, Greens, and independents—typically have the shallowest records, as many have never held legislative office. This disparity matters for opposition research: a Democratic primary challenger could use a Democratic incumbent's voting record to attack from the left, while a Republican general election opponent might highlight votes that are out of step with Massachusetts's moderate electorate. Campaigns should map each candidate's voting record against the state's political center of gravity. OppIntell's source-backed profiles allow campaigns to quickly identify which candidates have the deepest records and which present research gaps that could be exploited or defended.

Source-Posture Analysis: What Researchers Would Examine for Each Candidate

Source posture refers to the readiness of a candidate's public record for opposition research. For Massachusetts Senate candidates, the source-posture spectrum ranges from well-sourced (multiple years of roll-call votes, committee assignments, and sponsored legislation) to thinly sourced (no legislative history, only campaign materials). OppIntell tracks 3,713 well-sourced candidates nationally (with at least five source-backed claims) and 237 thinly sourced candidates (zero claims). In Massachusetts, all 52 candidates have at least one claim, but the average of 1,390 claims per candidate suggests many are well-sourced. However, the top three most-researched—Seth Moulton, Seth Moulton (duplicate entry likely reflecting multiple profile angles), and William R. Keating—skew the average. A researcher would want to examine each candidate's voting record on key Massachusetts issues: healthcare costs, education funding, infrastructure, and climate change. For candidates without a voting record, researchers would turn to public statements, debate transcripts, and media interviews. Campaigns should prepare for both scenarios: a deep-dive attack on a voting record or a character-based attack on a candidate with no record to defend.

Comparative Research Methodology: How to Analyze Roll-Call Votes Across the Field

OppIntell's platform enables campaigns to compare voting records across candidates using source-backed claims. For Massachusetts Senate, the first step is to identify which candidates have a legislative history and which do not. For those with records, researchers would extract votes on high-profile bills: the Inflation Reduction Act, the CHIPS and Science Act, and state-level budget votes. For state legislators, key votes include the Massachusetts Health Care Reform Act and the Student Opportunity Act. The second step is to compare voting patterns within party blocs. Do Democratic candidates show uniform support for progressive priorities, or are there splits on issues like housing policy or criminal justice reform? Republican candidates may differ on fiscal policy versus social issues. The third step is to identify outlier votes that could be used in primary or general election attacks. A candidate who voted against a popular bill may face a vulnerability. OppIntell's cross-platform verification (20 of 52 candidates) ensures that the data is reliable, but researchers should always verify votes against official sources, as roll-call data can have errors or omissions.

Research Gaps and Next Steps for Campaigns

Despite the depth of OppIntell's tracking, gaps remain. Of the 52 Massachusetts Senate candidates, only 20 are cross-platform-verified, meaning 32 candidates lack confirmation across FEC, Wikidata, and Ballotpedia. For these candidates, voting records may exist but are not yet aggregated. Researchers would need to check state legislative websites, local news archives, and candidate filings. Additionally, the 11 other-party candidates often have no legislative record, requiring researchers to rely on campaign materials and public statements. Campaigns should prioritize filling these gaps early, as a surprise voting record from a lesser-known candidate could shift the race. OppIntell's platform allows campaigns to track when new source-backed claims are added, enabling real-time research updates. For the 2026 cycle, the Massachusetts Senate race offers a rich field for roll-call analysis, but only if researchers invest in verifying and comparing the records that exist.

How OppIntell Supports Campaigns in Massachusetts Senate Research

OppIntell's automated candidate-intelligence platform gives campaigns a head start on understanding what opponents and outside groups may say about them. By aggregating source-backed claims from FEC filings, Wikidata, Ballotpedia, and official legislative sources, OppIntell reduces the manual work of combing through voting records. Campaigns can access profiles for all 52 Massachusetts Senate candidates, see their party breakdown, and identify which candidates have the deepest records. The platform also flags research gaps, allowing campaigns to focus their own research efforts on the most promising or vulnerable angles. For a race as competitive as Massachusetts Senate—where the Democratic primary may be the decisive contest—having a clear picture of each candidate's voting record is essential. OppIntell's data enables campaigns to anticipate attack lines, prepare defenses, and craft messaging that resonates with voters.