Biden will be in Atlanta around 1 p.m. at an undisclosed location for a fundraising event that is closed to the press. He is scheduled to fly back to Washington D.C. soon after.
Nunn is expected to capture the Democratic nomination for the Senate easily, but the general election against a Republican will be a fight.
While the once very conservative Georgia is slowly turning for Democrats with growing minority groups, the 2014 mid-term elections still favor Republicans.
At this point, the Georgia GOP has seven candidates running to replace retiring Saxby Chambliss (R-Ga). Nunn's win really depends on how strong and financially prepared her Republican challenger will be after a bruising primary fight.
The Republican National Committee (RNC) gave a statement about Biden's unexpected visit:
“After months of lying low and ducking the issues, Democrat Michelle Nunn has finally shown where her true allegiance lies: with the Obama Administration and its liberal agenda of government run health care, higher taxes, and record debt," said RNC spokesman Michael Short. "If the Obama Administration’s agenda is good enough for Michelle Nunn to support it in private, then why isn’t it good enough for her to support it in public?”