Anna Robinson plays at "The Phantom" slot machine at Bowlers Club in Central Sydney November 23, 2011. Australia has 197,000 slot machines, called "pokies", the highest number of machines per head in the world. Slot machines feed 62 percent of the A$19 billion-plus ($17.5 billion) annual gaming sector. But the gamblers, largely working-class Australians, are on a collision course with the Labor government as it tries to tackle problem gambling, a battle that can impact Prime Minister Julia Gillard's political future. Picture taken on November 23, 2011. To match Feature AUSTRALIA-GAMBLING/ REUTERS/Daniel Munoz (AUSTRALIA - Tags: POLITICS BUSINESS SOCIETY)