Coming Up on This Week with George Stephanopoulos

— -- This Sunday, George is joined by Sen. John McCain, R-Ariz., for an exlusive interview following his Thanksgiving trip to Iraq. Hear what McCain has to say about the impact of the troop surge and his campaign for the Republican presidential nomination.

Then, Democratic presidential candidate Gov. Bill Richardson, N.M., responds to McCain and discusses his plan to end the war.

On our "Roundtable," Andrew Sullivan, Jon Karl, Cokie Roberts and George Will debate the week's politics.

And our "Voice," actress Marlo Thomas on her "Thanks and Giving" campaign to benefit St. Jude's Children's Research Hospital.