sydney australia former deputy prime minister barnaby joyce clear way return parliament saturday win by-election month kick dual citizenship crisis cost government majority joyce return new england seat new south wales forecast lift primary vote least 10 point give prime minister malcolm turnbull welcome boost tough weeks stun victory turnbull tell supporters join joyce pub town tamworth exit poll predict large swing government history by-elections australia turnbull say add vindication coalition get band back together joyce one citizenship seven whose eligibility sit parliament throw doubt find dual citizens status bar politicians australia constitution prevent split allegiances high court rule oct. 27 joyce along four seven lawmakers ineligible remain parliament force by-election joyce find dual citizen new zealand status since rescind deputy leader position traditionally hold member junior coalition partner national party remain vacant since high court rule result come difficult time turnbull early week reverse long-held opposition full-blown inquiry country scandal-hit financial sector amid mount political pressure turnbull also see splinter within center right liberal-national coalition same-sex marriage conservative faction lead nationals anger promise push legislation historic public vote favor unions last day campaign by-election mar call new south wales nationals state leader deputy premier john barilaro turnbull step christmas gift nation comment quickly rebuff liberal party lawmakers joyce say unhelpful insult australia 's former deputy pm win by-election coalition boost