Arthur Godfrey is more or less forgotten these days, but it's hard to overstate how incredibly popular he was in the 1940s and 1950s. He was so popular, in fact, that President Eisenhower asked him to record a PSA alerting the country that we had just been attacked by the Soviets. Eisenhower figured only Godfrey could calm the country in such a horrible situation.
That PSA obviously never aired...but now a radio historian is trying to locate the audio. The full story is here. Nobody knows for sure where it is. If you know, there's a "contact us" link at the website.