Scottsdale Congressman J.D. Hayworth late Tuesday conceded defeat to former Tempe mayor Harry Mitchell in their contentious Arizona congressional contest. Mitchell, a Democrat, led Hayworth on election night but the Republican refused to concede until more early and provisional ballots were counted. Hayworth said in a statement Tuesday that it appeared he would not overtake Mitchell for the U.S. House seat representing Tempe, Scottsdale and Ahwatukee. The Arizona contest was an especially negative and bitter one, centering around ethics accusations, border security and the Iraq war. Mitchell's victory in a Republican-oriented suburban district was part of national tide for Democrats...