If not it should be on your ASAP priority list. Just think Stephen King & JJ Abrams meet "man travels back in time to prevent the assassination of JFK". It's every bit as good as that combination sounds. 8 episode mini series that's currently on episode 5 [produced by Hulu]. You can probably find it gratis on Putlocker.
I enjoyed the book, despite a slightly disappointing ending (for me anyway), and I've heard that the show isn't deviating too much from the premise, so definitely going to watch when it starts showing on our Fox (UK) channel next month. It certainly sounds like it's much better than the abomination of a TV adaptation that Stephen King's Under the Dome was!