"As a first time candidate without the advantages of the politicians in this race, I am extremely encouraged by the outpouring of support from concerned individuals willing to invest in this cause," Perdue said in a statement.

The haul is the biggest so far announced in the GOP primary. Rep. Jack Kingston (Ga.) also posted a solid quarter, pulling in $800,000, and has $2.9 million in the bank. The other candidates in the crowded Senate field have not yet announced their totals. Democrat Michelle Nunn brought in $1.7 million in her first 10 weeks in the race, she announced earlier this week.

Half of the money from Perdue is a loan, and he indicated he doesn't plan on giving his campaign much more for the race.

"I wouldn't expect others to invest in a cause that I was not willing to invest in myself.  However, I do not believe in self-funding a campaign," he said. "After these first weeks, I am confident that people are responding and we will have the resources needed to get our message out to the voters."

Sen. Saxby ChamblissSaxby ChamblissGOP hopefuls crowd Georgia special race Democrats go for broke in race for Tom Price's seat Spicer: Trump will 'help the team' if needed in Georgia special election MORE (R-Ga.) is retiring, creating an open seat in the Republican-leaning state.