I suspect the reason why at this stage you'd want to beat up the liberals rather than NDP is that the Liberals are, for both of the other parties, a source of potential defectors. You're not going to persuade many NDP supporters to stop supporting the NDP and come over to the Conservative side, or vice versa. However, the Liberal voter (or undecided voter who could be a liberal voter) will fall one way or the other. Once the liberal support base has been eroded and you've pillaged your share of former Liberal voters (assuming the attack ads work), there is a further exodus of support based on a desire to vote for a party that has a better chance to form government.
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