Plagiarism is borrowing others’ thoughts word for word and not giving them credit.
Its dishonest and it reflects poorly on whatever original ideas you may entertain.
How you would like it if I stole your money and claimed it was mine?
This is no different and isn’t behavior becoming of a decent person.
Theft is theft, period.
To steal it, first, it has to be a thought, and second, it has to belong to the person from whom I "stole" it. It I merely copy words he copied from someone else, I didn't steal anything.
Somebody does something genuinely original, someone else steals it and passes it off has his won original idea, he is a scoundrel of the worst order.
But this isn't a game of igotcha and you have fallen into the trap of modern academia of trivializing the issue, which is mostly used to benefit those who actually don't have a lot useful to say.
And as I showed at great length above, the issue CNN and the left have with Crowley is not that she stole their “ideas” - it’s that she ridicules their god-hero Obama and explains in very original prose exactly how he justifies expropriating and redistributing the advantages that had made the U.S. a great nation.