99chambers

Horizon · our Election Day forecast: polls, plus fundamentals like incumbency, fundraising and past results.

Pulse · polls only: where the races stand today, with no fundamentals and wider uncertainty.

What's the difference?

Pennsylvania · Pennsylvania Senate District 12 · Updated Oct 16, 2026

Maria Collett

DemocraticIncumbent

2026 race · Pennsylvania Senate District 12

>99% chance of winning · race rated Solid D

>99%<1%

99% chance of winning · race rated Solid D

99%1%
● Maria CollettINC● Robert F. Costello III
Full race forecast

Background

Current office
Pennsylvania State Senate, SD-12
Experience
State legislature
Past races on file
2 (2 won)

Links: Candidate list (source)

Electoral history

Earlier races in Pennsylvania, newest first, matched by name in the results archive.

  1. 2022

    State Senate · SD-12 Nov 8, 2022

    D · 59.8% · 77,532 votes

    Won
  2. 2018

    State Senate · SD-12 Nov 6, 2018

    D · 52.7% · 62,069 votes

    Won

Opponents in 2026