Actually, his only child was a daughter.
But what I'm really writing about here are the similarities between Harry Truman and George W. Bush. Here is a New York Times blog post, discussing whether Bush will be well-liked in retirement, as was Truman, who was vilified during his presidency at least as much as Bush has been.
I wrote here and here about this question.
I don't know that Bush's rehabilitation could happen quite as quickly as Professor Fish predicts. But I wouldn't be surprised to see it happen.
His post has elicited the expected BDS-type comments. But I imagine that, had the Web existed in 1951-52, a similar commentary about Truman would have been met with similar comments.