Coming Up on This Week with George Stephanopoulos

This Sunday, George broadcasts live from Museum of Nature & Science in Denver, the host city for the 2008 Democratic National Convention.

In an exclusive interview, Senator Obama's Chief Strategist David Axelrod discusses the vice presidential pick and previews the week to come.

Then, Former New York City Major Rudy Giuliani -- also a former Republican presidential candidate -- talks exclusively about his role as keynote speaker at the Republican National Convention and his reaction to the democratic VP nominee.

On the "Roundtable," ABC News' Donna Brazile, Cokie Roberts, George Will, and Mark Halperin join George to debate the week's politics.