I've watched my husband deliver hundreds of speeches over the years, from informal chats in town halls to national addresses on Inauguration Day.

But I've never seen him as nervous as he was last week, when he gave the commencement remarks to Chelsea's graduating high school class.

Nor have I seen him as overtaken with emotion, especially when our daughter doubled back after receiving her diploma on stage and threw her arms around her father.

I know from my relationship w ...

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