On December 12, 2002, she was appointed to the Senate on the recommendation of
Prime Minister Jean Chrétien. On January 29, 2014, Liberal Party leader
Justin Trudeau announced all Liberal Senators, including Ringuette, were removed from the Liberal caucus, and would continue sitting as Independents. The Senators referred to themselves as the
Senate Liberal Caucus even though they were no longer members of the parliamentary Liberal caucus. Ringuette announced, on February 2, 2016 that she was leaving the Senate Liberal caucus to sit as an Independent saying, in a statement, that "Canadians have been clear in their desire for a non-partisan Senate. The status quo is not acceptable." She joined the
Independent Senators Group later that year. She was deputy chair of the
Canadian Senate Standing Committee on Rules, Procedures and the Rights of Parliament in the
45th Canadian Parliament. == Electoral record ==