Former charity executive Michelle Nunn (D) has kept up her strong fundraising pace, pulling in $4.15 million in the last fundraising quarter for her Georgia Senate bid.

Nunn's campaign has now raised $13.35 million total. It did not announce how much is left in the bank. Nunn had nearly $4.8 million cash on hand at the beginning of July, but she has been on the airwaves in recent weeks.

Businessman David Perdue has not yet announced his fundraising numbers. Perdue had less than $1 million in the bank coming out of his July primary and has, so far, been outspent in the race, but the wealthy businessman has the ability to self-fund.

Nunn has used her bigger campaign fund to air more ads in recent weeks in what's become a tight race. The National Republican Senatorial Committee invested close to $1.5 million in Georgia on Friday.