In a radio interview in 2001, then-Illinois State Sen. Barack Obama noted -- somewhat ruefully -- that the same Supreme Court that ordered political and educational equality in the 1960s and 1970s did not bring about economic equality as well. Although Mr. Obama said he could come up with arguments for the constitutionality of such action, the plain meaning of the Constitution quite obviously prohibits it.

Mr. Obama is hardly alone in his expansive view of legitimate government. During the past month, Sen. John McCain (who,...