I've now read more FLOTUS speeches than I care to, and they all talked about parents, hard work, strong values being passed on to their husband and self. Just about the only time Democrats talk about that without charges of racism and white privilege. After all, Obama was raised in a white family and his grandmother was a banker who sent him to private schools. I still think Elizabeth Dole's speech in 96 was the best ever, and no one can borrow from that one. FYI: I'm watching NBC--it is devoting more time to this than necessary. Has NBC ever found fault with the Obamas?
However, if you don't like a candidate the wife is fair game it seems. I remember when a group from the American Library Association refused to attend (or maybe picketed) a speech by Laura Bush, a former librarian and big supporter of reading and archives. ALA is so left it could fall off the planet. And I remember people on the right criticizing Mrs. Obama for her toned arms! She always looks great, and is a great role model for girls who can't get out of jeans, but detractors couldn't see it.
I read one account that Michelle’s speech 8 years ago was the same as that 7 habits of highly successful people book. But can’t imagine why Trump's campaign staff wasn’t more careful. At least she didn’t say it was the first time she’d been proud of her country. Although, maybe she did—I didn’t hear the speech.
I was a speech writer for a state politician in my 1983 job for the state of Ohio; it was a lot of cut and paste from her old speeches plus mixing in current issues, then making sure it had her rhythm and style. In those days you didn’t have the internet for checking word phrases.