Last week Huntsman called Romney "completely unelectable"

Huntsman is endorsing Romney tomorrow. Just one week after Huntsman called Romney "completely unelectable." Kind of makes you wonder if someone leaned on Huntsman, especially since Romney reportedly won't even be attending the endorsement tomorrow - clearly this isn't an amicable endorsement. Now who might Huntsman and Romney know in common who would have the means, the motive, and a clear track record of heavy-handedness in order to get their way?