Geoffrey G. Diehl is an American Republican politician from the Commonwealth of Massachusetts. He is best known for his runs in both the 2018 United States Senate election in Massachusetts, and in the 2022 Massachusetts gubernatorial election, both of which were unsuccessful.

Quick Facts Member of the Massachusetts House of Representatives from the 7th Plymouth district, Preceded by ...
Geoff Diehl
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Member of the Massachusetts House of Representatives
from the 7th Plymouth district
In office
January 5, 2011  January 2, 2019
Preceded byAllen McCarthy
Succeeded byAlyson Sullivan-Almeida
Personal details
Born (1969-04-23) April 23, 1969 (age 55)
Austin, Texas, U.S.
Political partyRepublican (2009–present)
Other political
affiliations
Democratic (1996–2009)
Spouse(s)KathyJo Boss
Children2
EducationLehigh University (BA)
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Hailing from Austin, Texas and graduating at Lehigh College in Pennsylvania, Diehl was a member of the Democratic Party until around 2009, when he switched to the Republican Party. In his first electoral run, he beat then Massachusetts House member Allen McCarthy for the 7th Plymouth seat, before winning reelection two more times. When Thomas Kennedy, a sitting Massachusetts Senate member, died, Diehl ran for his seat in the special election, before falling to Michael Brady.

Diehl is a Trump Republican, and ran on a Pro Trump platform in both of his notable electoral runs. Since Massachusetts is one of the most Anti Trump states in the United States, it heavily damaged his campaigns, and led to his defeat twice.

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