Every professor who has ever graded a paper (like ME) knows that there is software that picks up plagiarism.......... even a tiny little bit.
The idea that the speechwriter didn't know this was Michelle's speech is absurd.
Melania probably didn't, but she claimed that she wrote it herself, so that's another matter entirely.....
I think she probably did compose it herself. I suspect that she had other first lady candidates' speeches to look at and may have just rolled some nice-sounding rhetoric into her speech. Was it a rookie error? Absolutely. Should someone have checked her speech before she gave it? Yes, they should have, and if they did and didn't catch this....well, another unforced error.
Having said all of that, I don't know much about Melania as a person, and I don't want to knock her for things that I really can't judge her on.
I'm going to be blunt here: some of the over-the-top criticism of Melania evokes TOS and the "destroy them at all costs" pack mentality. She may not be the ideal FL, but she certainly wouldn't be the worst FL we've ever had, keeping in mind who her husband is running against.
Does that mean she's persuaded me to support Trump? No. Who she is is not relevant to my opinion of her husband.