Gratitude is indeed our virtue, and it’s neither simply classical nor simply liberal. Hobbes does indeed endorse it, out of calculation, but that’s not the kind of thanks we have in mind.
So have a happy, humble, and grateful Thanksgiving!
Update: No, I’m not changing my mind about my wishes to you, but I am calling your attention to George Will’s piece on the Thanksgiving tradition and Jon Meacham’s, which tries to make the Thanksgiving tradition a little more anodyne than I’d like it. You might also be interested in this report, noting this poll.