But it is possible that the politicians of the 1850s were not inept. More recent studies have kept elements of the revisionist interpretation alive, emphasizing the role of political agitation (the efforts of Democratic politicians of the South and Republican politicians in the North to keep the sectional conflict at the center of the political debate). David Herbert Donald (1920–2009), a student of Randall, argued in 1960 that the politicians of the 1850s were not unusually inept but that they were operating in a society in which traditional restraints were being eroded in the face of the rapid extension of democracy. The stability of the two-party system kept the union together, but would collapse in the 1850s, thus reinforcing, rather than suppressing, sectional conflict. The union, Donald said, died of democracy.