of his adroit leadership, and thrust Saburō Eda into the leadership role instead. A centrist, Eda rapidly took the party in a more centrist direction, far faster than the left socialists were ready to accept. This led to growing infighting within the party, and drastically damaged its ability to present a cohesive message to the public. In particular, Eda earned the enmity of the party's left-wing due to his ambitious platform of ) and his related "Eda Vision" of socialism. The "structural reform" platform drew inspiration from the recently concluded Anpo protests against the U.S.-Japan Security Treaty, which had achieved massive size and forced the resignation of conservative prime minister Nobusuke Kishi. Eda and his allies viewed these protests as having been an unalloyed success in having allowed the JSP to play a leading role in fomenting a mass movement. Eda's "structural reform" platform called for a combination of parliamentary pressure tactics and Anpo-style extra-parliamentary mass movements that would gradually move Japan toward socialism by forcing the government into a series of piecemeal concessions. Above all, Eda and his fellow structural reformers hoped to broaden the base of the JSP beyond a hard core of labor unionists, leftist student activists, and Marxist intellectuals to encompass people from many walks of life, in order to dramatically increase the party's potential supporters at the polls. In an effort to build popular support for his reform program, Eda announced his "New Vision of Socialism", better known by its nickname, the "Eda Vision", in July 1962. Eda declared that "[s]ocialism must be defined in sunny and cheerful terms that are easily understandable to the masses. I believe that 'socialism' is that which allows human potential to blossom to its fullest extent. The main four accomplishments that humankind has achieved so far are America's high standard of living, the Soviet Union's thoroughgoing social welfare system, England's parliamentary democracy, and Japan's peace constitution. I believe that if we can integrate these, we can give birth to a broad-based socialism." The "Eda Vision" of a more moderate form of socialism was received enthusiastically in the mainstream Japanese press, polled well in public opinion polls. The "Eda Vision" was the final straw for the more orthodox Marxist left-wing factions in the JSP, who had already chafed against the moderate tone of Eda's "structural reform" platform. In particular, they could not accept praise of what they viewed as the