The NDP has claimed that last minute tactical voting cost them several seats last time, as left-of-centre voters moved to the Liberals so that they could prevent a Harper-led government. Jack Layton avoided stating his party's goal was to win the election outright, instead calling for enough New Democrats to be elected to hold the balance of power in a Liberal or Conservative minority government. Political commentators have long argued that the NDP's main medium-term goal is to serve as junior partners to the Liberals in Canada's first-ever true coalition government. NDP leader Jack Layton was concerned last time over people voting Liberal so that they could avoid a Conservative government. Over the course of the last week of the campaign, Jack Layton called on Liberal voters disgusted with the corruption to "lend" their votes to the NDP to elect more NDP members to the House and hold the Conservatives to a minority.