Geoff Diehl


Geoffrey G. Diehl is a Republican politician who represented the 7th Plymouth District in the Massachusetts House of Representatives from 2011-2019. 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. Diehl also served as a member of the House Library Caucus and Regional School Caucus. On November 2, 2010, he upset incumbent Allen McCarthy and was sworn in on January 5, 2011. He claimed to serve as Donald Trump's Massachusetts campaign co-chair during the 2016 presidential election.
On November 6, 2018, Diehl lost the U.S. Senate election in Massachusetts to Democratic incumbent Elizabeth Warren.

Personal history

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 double major in Government and Urban Studies. After graduating, he moved to New York City and worked in Advertising, and would later work television production in Los Angeles, California. He moved to his wife's home town of Whitman, Massachusetts in 2001 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. Prior to his election, Diehl was a member of the Whitman Finance Committee, and 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.

2010 Election

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.

Tank the Gas Tax Movement

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

U.S. Senate election 2018

In April 2017, Diehl announced his intent to challenge Elizabeth Warren for her U.S. Senate seat. In the Republican primary election held on September 4, 2018, Diehl finished first in a field of three candidates. The general election was held on November 6, 2018. Senator Elizabeth Warren defeated Diehl by twenty-four percentage points.

Electoral History