Andy Dinniman

In what was considered a political surprise, Dinniman won with 56% of the vote, becoming the first Democrat elected to represent Chester County in the state Senate since the 1920s.

Andrew E.. Dinniman (born 1944) is an American politician who served as a Democratic member of the Pennsylvania State Senate for the 19th District from June 2006 until 2020.

Dinniman was born in New Haven, Connecticut.

He received his BA from the University of Connecticut in 1966, and his MA from the University of Maryland in 1969.

He also holds an Ed.D from Pennsylvania State University.

Dinniman Taught at Prince George Community College and West Chester University.

Dinniman's first elected position was as a member of Downingtown school district's board of school directors.

He was first elected to this position in 1975, and held the post until 1979.

In 1979, Dinniman was elected chairman of the Chester County Democratic Committee, a position he held until 1985.

Dinniman later served as Chester County commissioner for three terms, beginning in 1991.

During his three terms as commissioner, Dinniman was the body's only Democrat.

After the death of Republican Senator Robert "Bob" Thompson in 2006, Dinniman sought and attained his party's nomination to run in the ensuing special election.

The special election pit Dinniman against his fellow county commissioner, Republican Carol Aichele.

Dinniman faced re-election in 2008.

He handily defeated Republican Steve Kantrowitz, a retired U.S. Navy Admiral, with 57.8% of the vote.

In 2009, the non-partisan political newspaper The Hill reported that Dinniman was "reportedly eyeing a run" for the Democratic nomination in the congressional seat being vacated by Republican Jim Gerlach, who was, at the time, running for governor.

Dinniman, however, ultimately did not enter the race.

He endorsed Manan Trivedi, a doctor from Reading, who went on to win the Democratic primary, but lost the fall general election to Gerlach.

Dinniman faced re-election in 2012.

He handily defeated Chris Amentas, an East Fallowfield Township supervisor, with 57.45% of the vote.

Dinniman faced re-election again in 2016 against Republican Jack London.

He handily won with 56.33% of the vote.

At the time of his retirement, Dinniman sat on five committees: Education; Communications and Technology; Agriculture and Rural Affairs; Environmental Resources and Energy; and State Government.

He was the ranking Democrat on the Senate's education committee.

After initially preparing for a re-election campaign, Dinniman announced he would not seek another term and retire at the end of 2020.

He was succeeded by Carolyn Comitta.