Geoffrey G. Diehl (born April 23, 1969) is an American Republican politician. He represented the 7th Plymouth district in the Massachusetts House of Representatives from 2011 to 2019.[1]

Geoff Diehl
Massachusetts State Rep. Geoff Diehl (cropped).jpg
Member of the Massachusetts House of Representatives
from the 7th Plymouth district
In office
January 5, 2011 – January 3, 2019
Preceded byAllen McCarthy
Succeeded byAlyson Sullivan
Personal details
Born (1969-04-23) April 23, 1969 (age 52)
Bethlehem, Pennsylvania, U.S.
Political partyRepublican (2009–present)
Other political
Democratic (1996–2009)
Spouse(s)KathyJo Boss
EducationLehigh University (BA)

He claims to have served as Donald Trump's Massachusetts campaign co-chair during the 2016 presidential election[2] but the title never existed in Trump’s 2016 Massachusetts campaign, and his involvement was only during the primary election but not the general election.[citation needed] In 2018, Diehl unsuccessfully challenged incumbent Democratic U.S. Senator Elizabeth Warren. He won the Republican nomination but received only 36% of the vote. He is a Republican candidate in the 2022 Massachusetts gubernatorial election.[3]

Early life and educationEdit

Geoff Diehl was born at St. Luke's Hospital in Bethlehem, Pennsylvania. He attended Lake Forest Academy and graduated from Lehigh University in 1992 with a Bachelor of Arts degree in government and urban studies.


After graduating, he moved to New York City and worked in advertising. He later worked in television production in Los Angeles, California.

In 2001, he moved to his wife's hometown of Whitman, Massachusetts, where he worked as an account executive in the sign industry. Diehl registered to vote as a Democrat in 1996 and supported various Democratic politicians throughout the late 1990s and early 2000s, including Massachusetts Attorney General Tom Reilly and Vice President Joe Biden before later registering as a Republican.[4]

Massachusetts House of RepresentativesEdit

2010 electionEdit

Diehl began his campaign for representative of the 7th Plymouth District on February 22, 2010. Diehl received support from previous representatives from the same district including Andrew Card, Michael Sullivan, Ned Kirby, and Ronald Whitney. Diehl also received the endorsement of U.S. Senator Scott Brown.[5]

On November 2, 2010, he upset incumbent Allen McCarthy and was sworn in on January 5, 2011.

He was a member of the Joint Committee on Housing, House Committee on Global Warming and Climate Change, and the House Committee on Technology and Intergovernmental Affairs.[6] Diehl also served as a member of the House Library Caucus and Regional School Caucus.

Tank the Gas Tax MovementEdit

Geoff Diehl was a lead supporter of the successful ballot question campaign to repeal the Massachusetts gas tax indexing law in 2014.[7]

2018 U.S. Senate electionEdit

In April 2017, Diehl announced his intent to challenge Elizabeth Warren for her U.S. Senate seat.[8][9] In the Republican primary election held on September 4, 2018, Diehl finished first in a field of three candidates.[10]

Diehl campaigned strongly on his support for President Trump. He endorsed Trump in 2016 and claimed to have been a state co-chair on his 2016 campaign. This claim was disputed or qualified by other Republicans, who noted that Diehl's position was purely honorary and only awarded after Trump had won the Massachusetts primary.[11] Diehl also publicly stated he would "have the President's back 100% of the time" during the primary.[citation needed]

The general election was held on November 6, 2018. Senator Elizabeth Warren defeated Diehl by twenty-four percentage points.

2022 gubernatorial campaignEdit

Following Diehl's 2018 Senate election loss to Elizabeth Warren he announced his candidacy for the MassGOP State Committee.[12] Diehl has continued to embrace President Trump and the Conservative wing of the party - including MassGOP Chairman Jim Lyons.[13]

In December 2020, Diehl began assessing a run for governor.[14] These rumors were further exacerbated when he stepped down from his position on the MassGOP Finance Committee;[15] possibly avoiding a conflict of interest in a potential primary. Diehl has also attacked Governor Charlie Baker for his reversal on his anti gas tax stance [16] and his lockdown measures during the COVID-19 pandemic.[17]

On January 25, 2021, Diehl joined with officials from the MassGOP State Committee calling for Gov. Baker to be censured over his comments in support of the Second impeachment of Donald Trump and demand that Baker retract his comments.[18]

In February 2021, Diehl attended a maskless fundraiser in West Roxbury with Steve Bannon as the special guest. The event broke many state and local COVID-19 rules.[19][20]

On July 4, 2021, Diehl formally announced his candidacy for governor.[21] Later that month Diehl backtracked on his comments made about the 2020 election during an interview with Jim Braude, saying “I don't think it was a stolen election,” Diehl said: “I just think that, again, at this point, we need to move forward, stop crying over spilled milk as a Republican Party and look towards the future.” [22]

Diehl has aligned himself with former president Donald Trump, who endorsed Diehl for governor on October 5, 2021. In August 2021, Diehl called for a forensic audit of Massachusetts's 2020 election.[23] In October 4, 2021, Diehl claimed that the 2020 presidential election was "rigged".[24] Diehl also called for Gov. Charlie Baker to dismiss a bill that would allow for mail-in voting permanently, claiming that absentee ballots have led to voter fraud.[24]

Electoral historyEdit

United States Senate election in Massachusetts general election results by county, 2018:
United States Senate election in Massachusetts, 2018[25]
Party Candidate Votes %
Democratic Elizabeth Warren (incumbent) 1,633,371 60.34
Republican Geoff Diehl 979,210 36.17
Independent Shiva Ayyadurai 91,710 3.39
Write-in Others 2,799 0.10
2016 Election for Massachusetts' 7th Plymouth House District
Party Candidate Votes %
Republican Geoff Diehl (Incumbent) 17,088 99.20
Write-in Others 144 0.80
2015 Special Election for Massachusetts' 2nd Bristol and Plymouth State Senate District[26]
Party Candidate Votes %
Democratic Michael Brady 14,397 56.9
Republican Geoff Diehl 10,245 40.5
Independent Anna Raduc 649 2.56
Write-in Others 10 0.04
2014 Election for Massachusetts' 7th Plymouth House District
Party Candidate Votes %
Republican Geoff Diehl (Incumbent) 11,528 99.20
Write-in Others 92 0.80
2012 Election for Massachusetts' 7th Plymouth House District
Party Candidate Votes %
Republican Geoff Diehl (Incumbent) 10,942 54.20
Democratic Robert L. Toomey, Jr. 9,232 45.70
Write-in Others 25 0.10
2010 Election for Massachusetts' 7th Plymouth House District[27]
Party Candidate Votes %
Republican Geoff Diehl 8,553 51.24
Democratic Allen J. McCarthy 8,132 48.72
Write-in Others 6 0.04

Personal lifeEdit

Prior to his entry to politics, Diehl was a member of the Whitman Finance Committee. He remains a member of the MetroSouth Chamber of Commerce, and South Shore Chamber of Commerce. Diehl is also an Eagle Scout. Diehl and his wife, KathyJo, have two daughters. They live in Whitman, Massachusetts.[citation needed]


  1. ^ "Representative Geoff Diehl".
  2. ^ Young, Shannon (August 11, 2016). "Massachusetts Democrats urge Geoff Diehl to resign as Donald Trump's state campaign co-chair".
  3. ^ Joyce, Tom. "Geoff Diehl To Run For Governor Of Massachusetts". NewBostonPost. Retrieved 7 July 2021.
  4. ^ Phillips, Frank. "GOP candidate Geoff Diehl once voted true blue". Boston Globe. Retrieved 12 April 2018.
  5. ^ Preer, Robert (31 October 2010). "Challengers, not all GOP, seek upsets". Boston Globe. Retrieved 9 September 2012.
  6. ^ "Representative Geoff Diehl". Retrieved 8 October 2018.
  7. ^ Matt Murphy. "Rep. Diehl leads way on gas tax question". Retrieved 8 October 2018.
  8. ^ O'Sullivan, Jim (April 6, 2017). "GOP's Geoff Diehl sets stage for challenge to Elizabeth Warren". The Boston Globe. Retrieved July 11, 2017.
  9. ^ "It's Official: Republican Geoff Diehl Is Running To Unseat Senator Elizabeth Warren". 2 August 2017.
  10. ^ "Massachusetts Primary Election Results". The New York Times. September 4, 2018. Retrieved September 4, 2018.
  11. ^ "Geoff Diehl Says He Was Co-Chair Of Trump's Bay State Campaign. Was He?". WGBH. October 31, 2018.
  12. ^ "Geoff Diehl For MA". Geoff Diehl For Governor.
  13. ^ Christian M. Wade. "Lyons wins another term as GOP chair". Salem News.
  14. ^ Murray, Stephanie. "BAKER's APPROVAL rating takes a hit — BOSTON TRASH piles up — EVICTIONS hit CITIES hardest". POLITICO.
  15. ^ "State Committeeman Geoff Diehl to transfer leadership of MassGOP Finance Committee". Massachusetts GOP.
  16. ^ @LocalPoliticsis (25 January 2021). "Governor Baker was against Gas Taxes before he was for them.Tank the Gas Tax kick off.This is how he became Gover…" (Tweet) – via Twitter.
  17. ^ "Diehl: Small biz dictates from government "untenable"". January 30, 2021.
  18. ^ "Members of MassGOP seek censure of Charlie Baker for support of Trump impeachment". January 26, 2021.
  19. ^ Emma Platoff. "Boston may sanction restaurant for COVID-19 violations at Republican event". The Boston Globe.
  20. ^ Rick Sobey. "Steve Bannon Speaks to Boston Republicans Trump will Lead us in 2024". The Boston Herald.
  21. ^ Mychael Schnell. "First Republican announces run for Massachusetts governor". The Hill.
  22. ^ Hannah Reale. "Geoff Diehl Makes His Case For Governor, Shows Some Distance From Trump". WGBH.
  23. ^ Kashinsky, Lisa (6 October 2021). "Trump endorsement falls flat in Massachusetts". POLITICO. Retrieved 2021-10-15.
  24. ^ a b Platoff, Emma (5 October 2021). "Donald Trump endorses Republican Geoff Diehl for Massachusetts governor". The Boston Globe. Retrieved 2021-10-15.
  25. ^
  26. ^ "PD43+ - 2015 State Senate Special General Election 2nd Bristol and Plymouth District". Retrieved 8 October 2018.
  27. ^ "PD43+ - Search Elections". Retrieved 8 October 2018.
Massachusetts House of Representatives
Preceded by Member of the Massachusetts House of Representatives
from the 7th Plymouth district

Succeeded by
Party political offices
Preceded by Republican nominee for U.S. Senator from Massachusetts
(Class 1)

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