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Not that I recall, but I listened to him less and less because his show was on at the same time as Rush Limbaugh, and I kind of switched to Rush.
If he did move left, it might have been from competitive pressures to differentiate himself from Rush.
Anyway for many, many years he was the only reliable conservative voice on the radio, at least nationally. I imagine there were conservatives on local radio, but with the "fairness doctrine" I don't know.
Paul Harvey was so gentle and understated in his conservatism that he was able to squeak past the Fairness Doctrine.