Pennsylvania State Senate District 12
Tue, Nov 3 · Represented by Maria Collett Democratic · Member list as of Oct 28
No published poll names both candidates.Last result · 2022 general: Maria Collett (D) 59.8, Robert Davies (R) 40.2
- Last election
- Maria Collett (Democratic) won by 19.6 points, 2022
- On the 2026 ballot
- 2 candidates
Side by side
Left column: CollettRight column: Costello
- Donor-based spectrum
- LiberalCentristConservativeCollettNo published score for Costello
- Races
- Won 2 of 2
- None listed
- Years since first win
- 8
- Not available
How these are counted
The spectrum is a published research score, not our rating. How this works. Wins and losses count the races in our results files, the same as each profile.
More about this race
Candidates on the ballot
- Maria CollettIncumbentDemocratic
- Robert F Costello IIIRepublican
Source: pavoterservices.pa.gov, dated Oct 28
All State Senate districts
- Democratic
- Republican
- Independent
- Nonpartisan
- More than one party
- No member listed
Map settings
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Official results for Pennsylvania
History (14 elections for this seat)
- Votes for listed candidates
- 129,565
- Election day
- November 8, 2022
- District map
- Older district map (2022)
Pennsylvania Senate District 12, 1970 to 2022, 2022, every candidate Candidate Party Votes and share Share DemocraticMaria CollettWon(incumbent) Democratic 77,53259.8% RepublicanRobert Davies Republican 52,03340.2% - Votes for listed candidates
- 117,811
- Election day
- November 6, 2018
- District map
- Older district map (2014 to 2021)
Pennsylvania Senate District 12, 1970 to 2022, 2018, every candidate Candidate Party Votes and share Share DemocraticMaria CollettWon Democratic 62,06952.7% RepublicanStewart Greenleaf Jr.(incumbent) Republican 55,74247.3% - Votes for listed candidates
- 79,442
- Election day
- November 4, 2014
- District map
- Older district map (2014 to 2021)
Pennsylvania Senate District 12, 1970 to 2022, 2014, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 50,31963.3% DemocraticRuth S. Damsker Democratic 29,12336.7% - Votes for listed candidates
- 98,014
- Election day
- November 2, 2010
- District map
- Older district map (2002 to 2013)
Pennsylvania Senate District 12, 1970 to 2022, 2010, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 62,74864.0% DemocraticRuth S. Damsker Democratic 35,26636.0% - Votes for listed candidates
- 99,192
- Election day
- November 7, 2006
- District map
- Older district map (2002 to 2013)
Pennsylvania Senate District 12, 1970 to 2022, 2006, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 56,93557.4% DemocraticJeff Albert Democratic 42,25742.6% - Votes for listed candidates
- 85,064
- Election day
- November 5, 2002
- District map
- Older district map (2002 to 2013)
Pennsylvania Senate District 12, 1970 to 2022, 2002, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 56,85866.8% DemocraticHoward P. Rovner Democratic 28,20633.2% - Votes for listed candidates
- 74,219
- Election day
- November 3, 1998
- District map
- Older district map (1992 to 2001)
Pennsylvania Senate District 12, 1970 to 2022, 1998, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 49,46866.7% DemocraticAndrew T. Hornak Democratic 22,96030.9% LibertarianMaureen A. Hoban Libertarian 1,7912.4% - Votes for listed candidates
- 80,871
- Election day
- November 8, 1994
- District map
- Older district map (1992 to 2001)
Pennsylvania Senate District 12, 1970 to 2022, 1994, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 57,62871.3% DemocraticAnthony Repici Democratic 19,47024.1% LibertarianKenneth N. Jacobine Libertarian 3,7734.7% - Votes for listed candidates
- 73,687
- Election day
- November 6, 1990
- District map
- Older district map (1982 to 1991)
Pennsylvania Senate District 12, 1970 to 2022, 1990, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 50,36668.3% DemocraticCharles R. Mulvany Jr. Democratic 23,32131.6% - Votes for listed candidates
- 60,923
- Election day
- November 4, 1986
- District map
- Older district map (1982 to 1991)
Pennsylvania Senate District 12, 1970 to 2022, 1986, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 60,923100.0% - Votes for listed candidates
- 82,733
- Election day
- November 2, 1982
- District map
- Older district map (1982 to 1991)
Pennsylvania Senate District 12, 1970 to 2022, 1982, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon(incumbent) Republican 58,04470.2% DemocraticFlieder Saul Democratic 24,68929.8% - Votes for listed candidates
- 81,530
- Election day
- November 7, 1978
- District map
- Older district map (1972 to 1981)
Pennsylvania Senate District 12, 1970 to 2022, 1978, every candidate Candidate Party Votes and share Share RepublicanStewart J. GreenleafWon Republican 56,47469.3% DemocraticBernard C. Bryman Democratic 25,05630.7% - Votes for listed candidates
- 80,723
- Election day
- November 4, 1974
- District map
- Older district map (1972 to 1981)
Pennsylvania Senate District 12, 1970 to 2022, 1974, every candidate Candidate Party Votes and share Share RepublicanWilmot E. FlemingWon(incumbent) Republican 44,41555.0% DemocraticGertrude Strick Democratic 36,30845.0% - Votes for listed candidates
- 80,263
- Election day
- November 3, 1970
- District map
- Older district map (1966 to 1971)
Pennsylvania Senate District 12, 1970 to 2022, 1970, every candidate Candidate Party Votes and share Share RepublicanWilmot E. FlemingWon(incumbent) Republican 41,90652.2% DemocraticMitchell A. Kramer Democratic 36,35345.3% OtherRobert J. Sekella Other 2,0042.5%
1970 to 2022: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), retrieved Oct 28, 2026. Compiled by Carl Klarner (Harvard Dataverse) from official returns; not an official source
Only part of this chamber is up in a given cycle. Which districts vote on which date is not on file. Last contest in this district on file: 2022.
Download and cite
Cite this page
Election Wrld. (2026). Pennsylvania State Senate District 12, election results 1970 to 2022. https://www.electionwrld.com/pa/senate/12. Retrieved October 31, 2026.
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<iframe src="https://www.electionwrld.com/embed/pa/senate/12" title="Pennsylvania Senate District 12" width="100%" height="400" style="border:0;max-width:640px" loading="lazy"></iframe>
<p style="font-size:13px">Data: <a href="https://www.electionwrld.com">Election Wrld</a>, CC BY 4.0</p>Sources
Sources: Census TIGERweb Legislative MapServer (120th CDs layer 0, 119th CDs layer 4, 2026 SLD upper layer 1 and lower layer 2) (US Census Bureau, public domain), retrieved Oct 28, 2026; Open Civic Data division identifiers (census_autogenerated us_sldl/us_sldu and openstates state files); also (sld-recent.json): Open Civic Data division identifiers (country-us) (CC0 (repository); also (sld-recent.json): CC0 1.0), retrieved Oct 28, 2026; Open States people (current) CSVs (CC0-1.0 (Open States people data)), retrieved Oct 28, 2026, compiled by Open States volunteers and staff (rosters from state legislature sites) from official returns, not an official source; State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse) (CC0 1.0), retrieved Oct 28, 2026, compiled by Carl Klarner (Harvard Dataverse) from official returns, not an official source.
District id: ocd-division/country:us/state:pa/sldu:12
DataState data (JSON)Sources: State Legislative Election Returns, 1967-2022 (Carl Klarner, Harvard Dataverse), DIME (ODC-BY)Data as of Oct 28, 2026