What happened to the Bengals?

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0-4? What is going on with this team? Defense is doing a good job this year, but the offense has completely lost their rythm. The three musketeers ( Carson, Chad and TJ) have looked totally out of sync this year. The offensive line has provided Palmer with absolutely no protection at all and he's been battered since the season started. Does anyone think it's time for Marvin Lewis to be replaced? I like Lewis, but since he's taken over his defense has ranked low on the totem pole, even though he was a defensive genius at Baltimore, and the team has gone progressively down hill the last few seasons. What do you all think?