Why is 0 tanking in the most recent Gallup Tracking Poll?

People are wising up. Obama is definitely tanking. I know people who were staunch Obama supporters two years ago and now have no use for him. I suspect that his approval ratings are even lower than 42%. Some previous obama supporters won't admit that they are disillusioned with him. Their real opinion will be noted when they get behind the voting booth curtains and silently vote against him.