Both of them.
Via Fox News:
John Kenneth Galbraith, the economist who both coined and lamented the term “conventional wisdom,” was a proud exponent of it where Richard Nixon was concerned.
The two had actually known each other a bit during World War II, when they served in the Navy together, long before the former went on to become President Kennedy’s ambassador to India. Asked in August 1974 whether there wasn’t “a little Nixon in all of us,” Galbraith famously replied: “I say the hell there is!”