I've been looking for this all day.
American Heritage Dictionary -(əb-sěsh'ən, ŏb-) n.
Compulsive preoccupation with a fixed idea or an unwanted feeling or emotion, often accompanied by symptoms of anxiety.
A compulsive, often unreasonable idea or emotion.
Chris Matthews has had to apologize for sexist comments he has made about Hilary. He has bashed her on his show every night. There is no love affair and no love lost between them. Hillary will not appear on Hardball, she is too smart for that.