A picture of Nixon and Prescott Bush. I've seen that picture on conspiracy theory websites. What's the non-conspiracy-theory context of that picture?
Not entirely sure when it was taken - I think late 40s/early 50s? Remember that Prescott Bush was a very close friend of people like W. Averall Harriman, Robert Lovett, and the Dulles brothers - aka, the "Wise Men" of early Cold War-era US foreign policy, and the bipartisan WASP Establishment in general.
Many (most?) of these men had gone to Yale, had been involved in elite WASPy banking firms like Brown Brothers Harriman (in which Prescott Bush had been a senior partner, along with the Harriman brothers, Lovett, and other "Wise Men" exemplars) and many had been part of the ultra-secretive Skull and Bones society at Yale (which was notorious for producing CIA officers, in addition to other foreign policy Establishment figures in the State and Defense Departments). Prescott Bush was very much a part of this elite inner circle of Skull and Bones alumni - and that was
before he was elected US Senator from Connecticut. He lived in Greenwich; how much more "Establishment" can you get?
Moreover, Bush was elected as a US Senator in a special election in 1952 - the same year in which sitting US Senator Richard Nixon was elected Vice President on Dwight Eisenhower's ticket. The two Dulles brothers headed the CIA and the State Department in Eisenhower's administration, and other WASPy Wise Men figures could be found throughout the rest of the administration. And Prescott Bush was not just a staunchly loyal ally of Eisenhower in the Senate; he was also one of Eisenhower's closest friends and confidants. Consider the fact that they were golf partners on a regular basis during Eisenhower's Presidency (Ike, of course, was a notoriously prolific and skilled golfer...
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Needless to say, Nixon knew Prescott Bush very well, I'd imagine - as well as any other Republican Senator in the Eisenhower years. Which would later be very helpful for Prescott Bush's most famous son...