Republican Presidential Candidate Debate #4 – Des Moines, Iowa 08/05/07 - Official Discussion Thread ABC News will be conducting a debate to be aired on This Week. The nine announced GOP presidential candidates meet in a campaign debate at Drake University in Des Moines, Iowa. George Stephanopoulos is the moderator; Des Moines Register political writer David Yepsen poses additional questions. Debate starts at 8 am CT (9 am ET/ 6 am PT) * check local stations for broadcast time in your area * Candidates participating Sam Brownback Rudy Giuliani Mike Huckabee Duncan Hunter John McCain Mitt Romney Ron Paul Tom...