This is the fifth of my series of essays on the relationship between the early American New Left and American tradition of democracy. It is devoted to SDS’s initial New Left movement in the North which derived from, paralleled and supported that of SNCC in the South. Following SNCC’s steps, SDS’s initial New Left movement took place in the real world, not in the academic world SDS originally expected. This, as pointed out in the first part of this essay, was due primitively to the ideas of SDS leaders themselves, but chiefly to SDS’s understanding of the ultra-Jeffersonian “new insurgency”—the ultra-Jeffersonian civil-right/New Left movement by Negroes in the South as well as in the North. That understanding combined with other secondary factors, as indicated in the second part of this essay, led directly to SDS’s first, largest and most important project, ERAP. But the emphasis of that part is on SDS’s ultra-Jeffersonian idea of organizing an interracial movement of the poor and the unemployed in Northern cities, and idea which originated in the successful organizing experience in Chester where the local SDS chapter spontaneously and independently organized the poor in the fall of 1963, and which some SDS leaders elaborated for the purpose of revivifying the ERAP which had not worked out at all the way it was supposed to during the first three months. SDS’s ERAP is analyzed, in the third part of this essay, as its attempt to test participatory democracy—it Jeffersonian/ultra-Jeffersonian challenge to non-Jeffersonian democracy in the North. The purpose of the analysis in that part in to find out the common patterns of the ten projects of ERAP in the summer of 1964, which were designed to implement the basic goal of ERAP as an interracial movement of the poor. Those patterns are discerned by means of two different kinds of comparison: one is between the Jeffersonian operation of ERAP and the pseudo-Jeffersonian practice of President Johnson’s “War on Poverty”; the other between the ultra-Jeffersonian JOIN and the Jeffersonian GROIN within ERAP. After winning the “JOIN v. GROIN” debate among ERAPers, the Jeffersonian GROIN became ERAP’s unanimous approach. Though it had made considerable strides over the summer, those Jeffersonian achievements were not what ultra-Jeffersonian ERAP had set out grandiosely to do; the interracial movement of the poor never emerged. The ERAP in the summer of 1965 was, however, ultra-Jeffersonian in practice. Influenced by SNCC, it had abandoned its national headquarters and abolished its national leaders in the name of participator democracy. Individual projects went off without central direction or assistance of any kind. In the absence of such an organizational content they changed as quickly and as irresponsibly as the whims of the individual organizers themselves. The isolation of individual organizing projects also led to the erosion of ERAP’s earlier Jeffersonian commitment to experimental and pragmatic organizing. In isolation, ach project came to develop an exaggerated sense of its own importance. It was not surprising that this late ultra-Jeffersonian ERAP turned out to be a complete failure. In addition to indicating symptoms of the failure of the ultra-Jeffersonian ERAP such as these, the last part of this essay also inquires into the various causes of its doomed failure, among which the most important was the ultra-Jeffersonian interpretation and performance of participatory democracy within ERAP.