There was a 'tea party' in the 1950's - it was called the Republican party under the leadership of Eisenhower. Eisenhower pushed the Interstate Highway system since he considered it important to "protect the vital interest of every citizen in a safe and adequate highway system." This belief was founded upon his observations of the German autobahn system and the strategic advantage it provided to them during WWII. There is no corresponding need for HSR.

Eisenhower deliberately avoided getting the United States involved in Vietnam - despite French entreaties for help, particularly at the battle of Dien Bien Phu. The US became involved in Vietnam during the Kennedy and Johnson administrations - a serious mistake.

Ike cautioned the nations of the danger of the 'military-industrial' complex'. Your example of the alternative engine for the F35 is a good example of this complex at work. Any administration could kill this program if it wanted to - however killing it had to wait until the new Republican congress did it on upon a largely party line vote with the 'tea party' leading the way.