What were some factors that made the Charismatic Renewalist Movement so effective?

The Charismatic renewal became a widespread topic for the secular and religious press, radio, and television because glossolalia was practiced by sophisticated middle-class church members for the first time in America. Neo-Pentecostal leaders and their churches were the subjects of numerous interviews and discussions in the media. In October of 1962, the glossolalia phenomena broke out in the academic community at Yale University among members of the evangelical Intervarsity Christian Fellowship there. Included in this neo-Pentecostal revival were Episcopalians, Lutherans, Presbyterians, Methodists, and even one Roman Catholic. Old classical Pentecostalism tended to be a separatist movement coming out of Methodism, prizing its separatist notions with the imminent coming of Christ providing the urgency for activity, the neo-Pentecostal movement is a “come in-ism” movement.