This is from Martin S. Pribble's blog, as is this.
For myself, I don't see any reason at all to believe that morality is objective in anything like the sense that Craig describes (that's a recurring theme of this blog). Indeed even if morality came from God it would not be objective in the sense that Craig seems to be getting at - moral norms would not be rationally binding on us all independently of our desires, values, etc. No doubt an all-powerful God could give us the desire to obey its commands, either for its own sake or to avoid painful punishments, but that's not the same thing.
There is, however, a social and psychological pressure to think that the "true" morality is rationally binding on us in a way that transcends all desires and has more rational clout than mere social norms or commands from others. Christian apologists often play to this, and there's no doubt that many people find the idea that morality is not, strictly, objective rather disconcerting ... and likewise, many people find the idea that God can somehow deliver an objective morality psychologically attractive. But disconcerting ideas can be true and psychologically attractive ones can be false.
The pressure I refer to provides a Christian apologist with powerful emotional weapons, but not with a sound argument for the existence of God.