Coming Up on This Week with George Stephanopoulos

April 4, 2008 — -- In a Sunday exclusive, George is joined by Sens. Jim Webb, D-Va., and Lindsey Graham, R-S.C., of the Senate Armed Services Committee. Next week, Gen. David Petraeus and Amb. Ryan Crocker will testify before the House and Senate to assess the state of the war in Iraq. Graham and Webb discuss the upcoming report and debate U.S. strategy in Iraq going forward.

Then, DNC Chairman Howard Dean talks with George about the ongoing race for the Democratic nomination. How long can it go on? Will superdelegates ultimately decide between Obama and Clinton? Dean talks about the party's plans to determine a Democratic presidential nominee.

And on our "Roundtable," the Nation's Katrina vanden Heuvel, Republican strategist Dan Senor, and ABC News' Cokie Roberts and George Will debate the week's politics.