Conservative ideology is broken.  As a group, they can no longer create solid policy that will attract enough voters to form a government.  Harper succeeded in uniting enough  right wing groups to achieve victory, but could not govern them as a group without pandering to the special interest groups.  Canadians quickly realised what was happening and rejected Harper's version of Conservatism.

Why OLeary?  Because without solid support for an absent policy, he is all they have.