Crown Attorney John McInnes told court there was no reasonable prospect for conviction due primarily to inconsistencies in the accuser's testimony and lack of witnesses.
House leader Dominic LeBlanc has sent letters to 33 people who received plum jobs in federal agencies or Crown corporations under Harper asking them to voluntarily resign.
Ambrose promises Conservative MPs will hold the Liberals to account as the government plans to increase spending and run deficits in order to stimulate the economy.
Mulroney reminded his audience of the Tory party's long, painful climb back to power after its crushing electoral defeat at hands of Jean Chretien's Liberals.