, March 2010. McCoy was appointed to the Senate by
Governor General Adrienne Clarkson, on the recommendation of Prime Minister
Paul Martin, on March 24, 2005. She represented Alberta as a member of the
Canadian Senators Group. Initially a member of the Progressive Conservative caucus, a rump caucus of Tory senators who had refused to join the new
Conservative Party of Canada in 2003, McCoy was ultimately the last Progressive Conservative in the chamber following the retirement of Senator
Lowell Murray in 2011. She changed her designation to Independent PC in 2013 and then to non-affiliated in 2016, following the decision by the government of Justin Trudeau to make the Senate a non-partisan institution and appoint independent senators. In September 2016, she and 14 other non-affiliated senators formed the
Independent Senators Group In December 2016, the Senate agreed to recognize the ISG and granted it funding, and also agreed that non-affiliated senators would be appointed to Senate committees in numbers proportionate to their numbers in the Senate. On November 4, 2019, she joined the Canadian Senators Group. After being appointed to the Senate, McCoy was an influential voice for the role of the individual senator, for Senate reform, for an inclusive federation and the role of Alberta in Canada. McCoy was one of the first members of the Senate of Canada to blog and tweet on her experiences in Ottawa and the political issues of the day. A feature article on McCoy in ''
Maclean's'' called her a "symbol of defiance" as one of only two Progressive Conservative senators then remaining in federal politics and someone who "defines herself as socially progressive and fiscally conservative". == Personal life ==