Pennsylvania › Montgomery County › Pennsylvania Senate District 12
2 candidates are tracked for Pennsylvania Senate District 12 on the November 3, 2026 ballot: Maria Collett and Robert F. Costello III. Candidate information follows official Montgomery County election filings; verify with the official election office linked below.
Maria Collett (Democratic), Robert F. Costello III (Republican) meet on the November 3 ballot; Maria Collett is the sitting member, per the General Assembly's roster. Maria Collett was unopposed in the Democratic primary. Robert F. Costello III was unopposed in the Republican primary. Pennsylvania nominates by plurality (no runoffs); unopposed nominees still print. The field is the Department of State's official May 19 primary returns (electionreturns.pa.gov) with the Department's post-primary withdrawal listing; independent and minor-party candidates who filed nomination papers are added when the Department of State posts the certified general-election list. This seat is elected by district; only the district covering your address appears on your ballot.
Democratic · Incumbent
Maria Collett is the Democratic state senator for Senate District 12 in Montgomery County, a registered nurse and former New Jersey Deputy Attorney General. She is minority chair of the Senate Aging & Youth Committee, per her official Pennsylvania Senate biography. No campaign website or questionnaire response was found as of September 7, 2026.
Republican
Robert F. Costello III is the Republican candidate for Pennsylvania Senate District 12 on the November 3, 2026 ballot, per the Department of State's official May 19 primary returns. No campaign website or questionnaire response was found as of September 7, 2026.