His theory of the "concurrent majority," elaborated in his posthumous work of political theory "A Disquisition on Government" (1851), argued a method for protecting voting minorities from the tyranny of the majority. In life, Calhoun had been a leading proponent of the concept of nullification, as he most forcefully articulated in the 1828 "South Carolina Exposition and Protest", which was published anonymously while he was vice president, in response to the protectionist Tariff of 1828, also called the "Tariff of Abominations."