It's true! Henry Blake #2 was related to the famous 1956 opponent of Dwight David Eisenhower for President of the US. BTW does any think does anything think Mash guest star Bob Simon looked a lot like Adlai Stvenson? Mr. Simon played the grateful general who gave the 4077th a bar in one ep. Simon has a scene with McLean in that same ep. Do you suppose off-camera McLean told Simon how much he (Simon) reminded him of cousin Adlai? I think he did.

I've actually heard this before. I also heard that McLean was actually maybe considering a career in politics, but (thankfully) when into acting instead.