ATLANTA — Every statewide official will be up for re-election this year in Georgia, and sitting atop the ballot will be one of the most closely watched U.S. Senate races in the country. In 2010, Georgia Republicans claimed every statewide office and Democrats were left to wonder how long it would take to rebuild. Four years later, Michelle Nunn and Jason Carter lead the Democratic ticket, posing a crucial test on how far the party has come.