Jon Ossoff, an investigative journalist and formidable fundraiser, leads the group of Democrats seeking to challenge Republican David Perdue by collecting nearly $2 million since he joined the race in September.

But a trio of other candidates who have yet to disclose their latest figures each reported raising less than half of what Lieberman said he collected during the last fundraising quarter.

Lieberman, an educator and entrepreneur, is certain to face significant opposition in the November special election to fill the remaining two years of Isakson’s term. Several high-profile Democrats are considering a run, including DeKalb chief executive Michael Thurmond and the Rev. Raphael Warnock.

Loeffler, a wealthy financial executive, has pledged to spend at least $20 million of her own fortune on the race. Another Republican, U.S. Rep. Doug Collins, is also weighing whether to run with support from some of President Donald Trump’s network of allies.