A possible tariff war with the United States, Justin Trudeau’s departure and the Liberal leadership race are all upsetting Conservative Leader Pierre Poilievre’s campaign plans.And behind the scenes, not all Conservatives agree on how to adjust.”The carbon tax is no longer the ballot box question,” a Conservative source in Western Canada told Radio-Canada. “But we’ve invested so much money fine-tuning that message, it’s hard to abandon it completely.”Sources told Radio-Canada the Conservative Party has commissioned a series of internal surveys to find the best way to adapt Poilievre’s message. The aim is to test new lines of attack against the…