At least $2.5 million of that was spent to oppose Ossoff, the former congressional aide who has led most polling in the race, partly because of fractured support among Republicans. Ads targeting Ossoff have claimed he lacks experience and is too closely tied to top Democrats.

One even hit him for dressing up as "Star Wars" character Han Solo when he was in college. Another tied Ossoff to terrorist groups, even including an image of Osama bin Laden, because his filmmaking company reportedly produced documentaries for news outlet Al Jazeera.

There is nothing to indicate that Ossoff has any ties to terrorist organizations. His campaign manager Keenan Pontoni called the ad a "smear attack" and said it was "truly shameful."

In a statement, he said Ossoff is "proud of his work as an investigative filmmaker."

Ossoff has easily outraised his opponents. As of March 29, Handel raised about $463,000, Hill garnered about $473,000 and Moody about $108,000.

All the more unusual is the Hollywood attention Ossoff has attracted. Actor Jon Cryer and comedian Chelsea Handler both donated $2,700 to his campaign, and actress Alyssa Milano has publicly supported him, prompting an attack from Handel.

If no candidate in the April 18 election wins 50 percent of the vote, it goes to a June runoff. The top two candidates will advance regardless of party.

One recent poll showed Ossoff with 43 percent of support, well ahead of Handel's 15 percent. However, he faces a much tougher task in a runoff, as support would likely coalesce around a Republican.

Trump won the district by only 1.5 points last year. Still, Price got more than 60 percent of the vote there in 2016.