Michell Obama lifted phrases from her and her husband's "Bible" - "Rules for Radicals" by Saul Alinsky.
Michelle Obama Copied Alinsky in Speech Melania Trump Plagiarized
That's not plagiarism. Like, at all....
If Michelle got up and stated "We need to make our decisions based on the world as it is, not based on a fantasy of the world as it should be"...THAT would be plagiarism.
Simply having the same words, in and of itself, does not make it plagiarism.
If I say:
"One of my favorite moments from college was my Political Philosophy class. The moment it really clicked for me was when I was listening to my Professor and he talked about how 'feared or loved? you should wish to be both' and if both is not possible than better to be 'feared than loved'"
That is not plagiarism, despite the fact that the words "...feared or loved? you should wish to be both" and "...feared than loved" are direct words coming forth from Machiavelli's "The Prince". Why? Because I'm not, in any way, suggesting that those words/ideas are my own, but rather I am indicating quite clearly that they're not.
At worst I would be, as Michelle is doing here, potentially sloppily misattributing the origin of the words to the individual I heard them from as opposed to their originator. But it wouldn't be accurate to call it plagiarism.
By your own seeming indication, you believe that this "rules for radicals" is their "bible". Well, would it not make sense then that Michelle absolutely DID hear Barack talking about those specific words in the fashion she just said?
If someone stated that, while listening to a friend talk, I was struck by what he talked about; how "god so loved the world" and "eternal life"...that person would not be "plagiarizing the bible. They would be reciting something they heard someone else said, and the person they were listening to was likely quoting and/or paraphrasing the bible when they were listening.