Republican presidential hopefuls in the United States have just over a week to impress voters in Iowa.<br /><br />It will be the first state to vote for a potential candidate who will be up against Barack Obama in next year's election.<br /><br />But the chase to the White House, has brought out a rather vindictive side to most candidates as they vie to discredit one another in the media.<br /><br />Al Jazeera's John Hendren reports from Washington.
