"With your continued support, we can inspire and mobilize Georgians to bring innovative problem solving, civility, and leadership to Washington. We have a tough and challenging road ahead, but I know that with the partnership of thousands of friends like you, we can create real change for our state and our nation."

Nunn, the daughter of former Sen. Sam Nunn (D-Ga.), is running for retiring Sen. Saxby ChamblissClarence (Saxby) Saxby ChamblissA hard look at America after 9/11 Lobbying World Former GOP senator: Let Dems engage on healthcare bill MORE's (R-Ga.) seat, and may be the Democrat with the best chance to pick up a Republican-held Senate seat this election cycle.

The fast fundraising start is no shock — she's been highly touted by national Democrats and has the support of EMILY's List, a group with a strong donor list that backs pro-abortion rights Democratic women. Nunn did not say how much cash on hand she has.

It will be difficult for any Democrat to win in conservative-leaning Georgia. But Democrats are hopeful the GOP will nominate a flawed candidate from its crowded primary field. Rep. Paul BrounPaul Collins BrounCalifornia lawmaker's chief of staff resigns after indictment Republican candidates run against ghost of John Boehner The Trail 2016: Let’s have another debate! MORE (R-Ga.), whose Tea Party-fueled candidacy has many Republicans nervous, won the endorsement of the national conservative group Citizens United on Tuesday.

But Rep. Jack Kingston (R-Ga.), a candidate better liked by the GOP establishment, continued his strong fundraising with an $800,000 quarter. Kingston now has $2.9 million cash on hand.