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.