Queensland independent Bob Katter has had his arm twisted "pretty firmly" by former prime minister Kevin Rudd to support Labor.

Mr Katter revealed Mr Rudd had tried to persuade him to back a government led by Julia Gillard, who toppled Mr Rudd in a dramatic coup in June that has been blamed for costing Labor seats in Queensland.

Mr Katter refused to rule out supporting Labor, and praised Mr Rudd's leadership - saying he had never indulged in the sort of vote-buying that former Coalition prime minister John Howard had indulged in to sandbag marginal electorates.

He said Labor and Mr Rudd's support for a National Broadband Network (NBN) and the creation of the national electricity grid were not electorate-buying policies.