The story-- the legalization issue is a short bit starting at about 3:55.
It's interesting that he uses utilitarian arguments (the prison system is very expensive, recidivism is high, the punishments are disproportionate to the crimes) rather than religious arguments.
My take on it was a simple "that's odd enough to be interesting"-- you can get some discussion here, with the interesting point that Robertson isn't the first to come out in favor of legalization after their career is past its peak.
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