Starting in the early 1980s, up through well into 2009, the individual mandate was an eminently respectable Republican position, embraced by conservative policy wonks and leading Republicans. Since then, virtually the whole of the conservative movement has coalesced around the position that the individual mandate is not merely misguided but actually unconstitutional, a fact conservatives somehow overlooked during the previous three decades. Indeed, conservatives now believe that the policy they once embraced (or at least tolerated) would amount to an abrogation of the very principle of limited government.