What exactly is the point of this map if it does not exclude Social Security, Medicare and defense? For example, not a lot of people work in Florida and retire to New Jersey, it is absurd to suggest Montana and Wyoming taxpayers are solely responsible for Malmstrom AFB and Francis E. Warren AFB respectively, etc.
The big one in my book is highway money. I mean the populations of some of these states are tiny and the principal beneficiary of many of these expenditures like Highway's don't even live there instead they are passing through. Yet when you divide a highway by a population that is 1/20th(or more) of some of these bigger states you might boost your spending per capita total in that state by a noticeable amount.