Act of 1965, but voted against the 24th Amendment to the U.S. Constitution. He resigned on September 9, 1968, to accept Governor Nelson A. Rockefeller's appointment to the United States Senate, filling the vacancy caused by the assassination of United States Senator Robert F. Kennedy on June 5, 1968. Because a special election to fill the vacancy would not be held for over two years, public objection to the length of Goodell's appointment led to a failed legal challenge to the Governor's power to appoint Senators in the event of a vacancy, Valenti v. Rockefeller. Although he had been a moderate to conservative member in the House, as a Senator he was nearly as liberal as New York's other Republican Senator, Jacob K. Javits. In the Senate, Goodell authored and sponsored a large number of bills, including several to provide conservation and development aid to small towns and rural areas. Many small upstate New York communities without municipal sewage systems built them with the aid of federal matching funds provided by Goodell's legislation. He "joined the quasi-pacifist Oregon senator Mark Hatfield as the loudest anti-Vietnam War voices in the Republican Party." Anti-war protesters and activists praised his advocacy of a withdrawal from Vietnam. In 1970, the New York Republican Party was split deeply over the issue of the Second New Right conservatism of much of the grassroots support for the party versus the perceived liberalism of the party organization, leadership, and Governor Rockefeller himself. While Rockefeller's supporters were strong enough within the party and its regular organization to assure Goodell's receiving the party's nomination for what would be his first full term, conservative activists left the party en masse to support someone farther to the right. Additionally, then Vice-President Spiro T. Agnew, alluding to Goodell's shift from moderate-conservative Republican to liberal Republican, went so far as to call him the "Christine Jorgensen of the Republican Party," analogizing his ideological shift to Jorgensen's highly publicized gender reassignment. Goodell was not discouraged. Running under the slogan "Senator Goodell — He's too good to lose", he received the nomination of the Liberal Party as well as that of the regular Republican organization, an electoral fusion allowed under New York law. One television ad aired by Goodell's campaign just before election day in 1970 contrasted his record with his two opponents. A voice over the graphics said "New York voters face real choices in