Georgia Democrat Michelle Nunn had another strong fundraising quarter, bringing in $2.4 million during the first three months of 2014. It's the most money she has raised in a quarter since launching her U.S. Senate campaign.

Nunn's campaign announced Nunn's total Monday, saying 20,000 donors have given to the campaign since Nunn kicked it off last year. The campaign did not say how much money Nunn had in her campaign account at the end of March. At the end of 2013, she had nearly $2.5 million.

Nunn has been the fundraising standout of the Georgia race. Republican Rep. Jack Kingston raised $1.1 million, while Reps. Paul Broun and Phil Gingrey were each reportedly under $500,000 for the quarter.

The crowded Republican primary field will be whittled on May 20. Most observers expect the top two finishers to advance to a runoff, which would happen if no candidate wins a majority. Nunn has a clear path to the Democratic nomination.