Of all the troubling aspects of the Obama presidency, none is more dangerous than the president's persistent pattern of lawlessness, his willingness to disregard the written law and instead enforce his own policies via executive fiat. On Monday, Mr. Obama acted unilaterally to raise the minimum wage paid by federal contracts, the first of many executive actions the White House promised would be a theme of his State of the Union address Tuesday night.

The president's taste for unilateral action to circumvent Congress should...