Senator BIRMINGHAM (South Australia) (14:47): Mr President, I ask a further supplementary question. Why is it that Australians, who will have to pay more under Labor's carbon tax, are now being made to pay also for Labor's political advertising to sell its carbon tax; and why is it that the minister will not rule out using taxpayers' money to line the pockets of Labor's political mates and allies, like GetUp! and the ACTU, who are already doing your bidding? Opposition senators interjecting— The PRESIDENT: We will proceed when there is silence. Minister.