Senator Johnny Isakson raised more than $1.6 million in the first three months of the year, according to an aide.

Fundraising reports are not due with the Federal Election Commission until Thursday, but an Isakson spokeswoman previewed the campaign’s filing with Tipsheet Tuesday.

The GOPer, who faces reelection next year, will report a cash balance of $3.75 million and zero debt, a far stronger financial position than this time last cycle.

“I am proud that Georgians continue to feel that I effectively represent their interests in Washington,” Isakson said in a statement. “I look forward to this campaign and supporting all those conservative candidates across the country who are also dedicated to keeping our Republican majority and taking back the White House.” 

His campaign had raised less than $400,000 in the first quarter of 2009 and had a war chest of just $2.47 million, according to the Atlanta Journal-Constitution.

Isakson already faces one nominal challenge—from MARTA engineer Derrick Grayson, who secured just over 6,000 votes in last year’s Republican Senate contest—but the 70-year-old is hoping to preemptively big foot any serious primary trials by posting strong fundraising numbers lest any would-be challengers think him easy prey.