ATLANTA — Democrat Michelle Nunn this week released five years of federal tax returns as she awaits the winner of a July 22 runoff between Republicans Jack Kingston and David Perdue for Georgia’s open Senate seat. To gain insights into the candidates’ personal finances, The Associated Press requested access to the last 10 years of tax returns of the major candidates in the race. Perdue released 10 years of returns ahead of the May 20 primary, while Kingston provided access last month to five years.