Four years into full operation, President George W. Bush's Medicare prescription drug program is coming in well below its projected cost, giving hope to backers of the new health insurance law that it, too, could beat budget expectations.The numbers are stark and conclusive: In 2009, the government spent $60.8 billion on the drug benefit, or far less than the annual $111.2 billion cost projected just five years ago, after the program was enacted.The lower cost - a result of slowing demand for prescription drugs, higher use of generic drugs and fewer people signing up - has surprised even some of...