Some excerpts from a very good article by John Yoo, appearing in The Wall Street Journal:
While some conservatives may think Justice Roberts was following in Justice Marshall's giant footsteps, the more apt comparison is to the Republican Chief Justice Charles Evans Hughes. Hughes's court struck down the centerpieces of President Franklin Roosevelt's early New Deal because they extended the Commerce Clause power beyond interstate trade to intrastate manufacturing and production. Other decisions blocked Congress's attempt to delegate its legislative powers to federal agencies.
But Hughes sacrificed fidelity to the Constitution's original meaning in order to repel an attack on the court. Like Justice Roberts, Hughes blessed the modern welfare state's expansive powers and unaccountable bureaucracies—the very foundations for ObamaCare.