From July 1995 to April 1997, Premier Mike Harris assigned him as the Parliamentary Assistant to the Minister of Agriculture, Food and Rural Affairs.
In 1998, he was responsible for a spearheading a government decision to deny Ontario Health Insurance Plan (OHIP) coverage to patients seeking sex-change operations.
On April 25, 2002, newly minted Premier Ernie Eves appointed him to the position of parliamentary assistant to the Minister of Finance, Janet Ecker.
The Progressive Conservatives were defeated in the provincial election of 2003, and Beaubien lost his seat to Liberal Maria Van Bommel by over 3,500 votes.
[3] The following year, he challenged long-serving Liberal MP Roger Gallaway in the federal riding of Sarnia—Lambton, and lost by over 5,000 votes.