According to Gene Steuerle, Medicare, Medicaid, Social Security and interest payments are going to crowd out everything else the federal government is doing:
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Source: Tim Roeper and Eugene Steuerle. Based on the President's proposed spending as analyzed by the Congressional Budget Office, "A Preliminary Analysis of the President's Budget and an Update of CBO's Budget and Economic Outlook" March 2009.
Of course, it’s not entirely bad to crowd out everything else the federal govenment is doing.
Ideally, we should crowd out all other programs and reduce health spending as well.