Arm I: Patients will receive Cetuximab and Radiation Therapy. Patients will receive a dose of Cetuximab through Intravenous (IV). The initial dose is 400 mg/m2 administered as a 120-minute intravenous infusion (maximum infusion rate 10 mg/min) and weekly dose is 250 mg/m2 infused over 60 minutes (maximum infusion rate 10 mg/min) until disease progression or unacceptable toxicity. Radiation treatment for Colorectal Cancer are Intensity Modulated Radiation Therapy (IMRT). IMRT delivers radiation directly to the tumor and modulates the intensity of the radiation with laser accuracy.