Why did Lou Dobbs leave CNN?

This week, Lou Dobbs surprised the world by announcing that he would be leaving CNN. Known for his inflammatory views on immigrants, particularly those of Mexican descent, Dobbs was one of the founding anchors of CNN. So why leave the network? We explore that question with media analyst Johnnie Roberts, and OC Weekly staff writer Gustavo Arellano (who is also known for his nationally syndicated column ?Ask a Mexican?).