I have a vague recollection that June Allyson said it was her late husband Dick Powell who talked Ronald Reagan out of liberalism and into conservatism. I don't know if that's true, but I think it is true that she and Ronald Reagan were good friends, which says a lot about her IMHO.
And ditto on the Glenn Miller story -- one of the great bios.
It was that movie that got me interested in the music of Glenn Miller.
She was a talented and classy lady. Something that "stars" nowadays can't claim.
Until someone posted it, I had forgotten "Four Star Productions." There's a memory of my childhood that hadn't surfaced in years!
The way I read it once was Dick and June had been trying for years to convince Reagan. One day, he said, all right you've convinced me. Dick to turned to June and said now the SOB will probably wind up being President of the United States. RIP, June, Dick, and Ronnie.