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From 1990-94, he was the ranking Republican member of the Senate Energy and Natural Resources Committee, and in 1992, was a key force behind passage of the far-reaching Energy Policy Act.<ref name=NYTobit/>

From 1990-94, he was the ranking Republican member of the Senate Energy and Natural Resources Committee, and in 1992, was a key force behind passage of the far-reaching Energy Policy Act.<ref name=NYTobit/>

In 1994, a strongly Republican year nationally, Wallop did not seek a fourth term but became the director of the conservative Frontiers of Freedom Foundation think tank.<ref name=vacaville/>He was succeeded as senator by fellow Republican [[Craig. Thomas]], who was ten days older than Wallop and died in office in 2007, when he was succeeded by Republican [[John Barrasso]].  ''The Economist'' wrote of Wallop: "Although his detractors have steadily grown in number, even Democrats grudgingly admitted to liking his candor and his willingness to be stupendously politically incorrect."<ref name=NYTobit/>

In 1994, a strongly Republican year nationally, Wallop did not seek a fourth term but became the director of the conservative Frontiers of Freedom Foundation think tank.<ref name=vacaville/>He was succeeded as senator by fellow Republican [[Craig Thomas]], who was ten days older than Wallop and died in office in 2007, when he was succeeded by Republican [[John Barrasso]].  ''The Economist'' wrote of Wallop: "Although his detractors have steadily grown in number, even Democrats grudgingly admitted to liking his candor and his willingness to be stupendously politically incorrect."<ref name=NYTobit/>

In 1996, Wallop was the general chairman and executive director of the [[Steve Forbes]] campaign for the Republican presidential nomination. Forbes obtained primary wins in [[Delaware]] and [[Arizona]] but lost the nomination to Senater [[Bob Dole]] of [[Kansas]], who was then defeated by incumbent [[Bill Clinton]].<ref name=e name="ffbio"/>

In 1996, Wallop was the general chairman and executive director of the [[Steve Forbes]] campaign for the Republican presidential nomination. Forbes obtained primary wins in [[Delaware]] and [[Arizona]] but lost the nomination to Senater [[Bob Dole]] of [[Kansas]], who was then defeated by incumbent [[Bill Clinton]].<ref name=e name="ffbio"/>

Wallop died in Big Horn, Wyoming, at the age of seventy-eight of a long illness He was survived by fourth wife, Isabel Brooke Thomasson Ferguson Wallop and his four children from the first marriage.<ref name=NYTobit/>

Wallop died in Big Horn, Wyoming, at the age of seventy-eight of a long illness He was survived by fourth wife, Isabel Brooke Thomasson Ferguson Wallop and his four children from the first marriage.<ref name=NYTobit/>