Comedian Rick Mercer has offered, via Twitter, to host a 1-on-1 debate between Prime Minister Stephen Harper and Liberal leader Michael Ignatieff, with $50,000 going to the charity of each politician’s choice. Ignatieff has accepted the terms of the debate with a tweet saying “I’m in,” and that he would donate the proceeds to the Alzheimer’s Society. Harper has yet to respond to the debate challenge. Mercer mused on Twitter that the debate could be held at Toronto’s Massey Hall. The official debates, held by the broadcast consortium of representatives from CBC/Radio-Canada, CTV, Global and TVA, will be held on April 12 in English and April 14 in French.