In 2002, Cronin worked as press secretary for gubernatorial candidate
Jerry Brady, who was defeated by
Dirk Kempthorne. The following year, Cronin served as press secretary for State Representative
Dave Bieter in his successful bid for
Mayor of Boise. Cronin ran for office in 2004, for the Idaho House seat in District 19 that was vacated by longtime Representative Ken Robison. Cronin placed second in a three-way Democratic primary, losing to
Nicole LeFavour. In 2008, when Senator
Mike Burkett retired and LeFavour ran for his Senate seat, Cronin ran again for state representative in District 19, defeating Republican Kevin McGowan. He was re-elected to a second term in 2010, defeating Republican John Magnan. In late 2010, House Democrats elected Cronin as their Minority Caucus Chairman. Cronin, who serves on the Environment, Energy, & Technology Committee, graduated from the Legislative Energy Horizon Institute in 2010. The Institute, sponsored by the
Pacific Northwest Economic Region (PNWER) and in partnership with the
National Conference of State Legislatures (NCSL) and the
U.S. Department of Energy, selects energy-minded legislators from both the U.S. and
Canada to participate in an 18-month university certificate program in energy policy planning awarded through the University of Idaho. In the 2011 legislative session, Cronin became known as the leading voice opposing Superintendent
Tom Luna's "Students Come First" reform plan. Despite his fierce opposition, Cronin earned praise from Luna and House Education Committee Chairman
Bob Nonini in an
Idaho Statesman profile of Cronin. Cronin's impassioned debate against the various pieces of legislation that Luna proposed was widely quoted throughout Idaho and around the country. In the fall of 2011, Cronin was selected as a Rodel Fellow at the
Aspen Institute. Each year, the Aspen Institute selects 24 “rising stars” in state or local government from around the nation for a two-year fellowship, designed to foster thoughtful leadership, bi-partisan collaboration, and new approaches to problem solving. Following the 2011 legislative session, Cronin was named an MVP by the Idaho Public Employees Association along with Senator
Dean Cameron (R-Rupert). In November 2011, Cronin was recognized, together with Senator
Denton Darrington (R-Declo), as an "Idaho Statesman of the Year" by the
Pi Sigma Alpha political science honor society at
Idaho State University. And in December 2011, New DEAL Leaders—a group of "pro-growth progressives" headed up by
Maryland Governor
Martin O'Malley and Senator
Mark Begich (D-
Alaska)--announced that Cronin was one of their honorees. Cronin did not seek reelection to the Idaho Legislature in 2012. He was succeeded by fellow Democrat
Holli High Woodings. == Committee assignments==