How aggressively stupid is America when it comes to our debates over taxes, budgets and the size of government? That's been difficult to answer with any precision, beyond simply citing the Tea Partier who famously told his congressman to "keep your government hands off my Medicare." But now we have some hard numbers to tell us how deep this ignorance really goes.

According to new data crunched by Cornell University's Suzanne Mettler, large numbers of Americans who receive benefits from govern...