If it's never even a remote consideration that the NDP may break from the Liberals and side with the CPC in the House of Commons, aren't they essentially a vassal for the LPC, soaking up votes from disaffected Liberal voters and funneling them back into Liberal control? I mean from a simple game theoretic perspective, Liberals in the long run can demand everything and give nothing. I think Canadian politics has probably been damaged by overapplying the American left-right political spectrum, when it may be better thought as a three way spectrum between liberalism, conservatism, and democratic socialism (something like Red Toryism for example would be pretty inconceivable in American politics).