Pauline Hanson has all but guaranteed a preference deal with the Coalition for the Farrer byelection, ramping up her war on preferential voting as left-wing activist group GetUp! re-emerges with a big-money campaign that could help elect a Climate 200-backed independent. Former prime minister Tony Abbott hit the streets of Albury on Thursday to convince Liberal supporters to stick with the struggling party, warning in remarks to this masthead about the enormous difficulty of clawing support back from One Nation. The Liberal and National campaign machines are in full tilt as they struggle to fend off a South Australia-style walloping at the hands of One Nation in the regional NSW seat formerly held by Sussan Ley. The Liberal Party directed its voters to preference One Nation above Labor in South Australia, where the populist party may win as many seats as the Liberals, and Hanson said she would work with the federal Coalition.…