By Monday, when the deadline to apply passed, more than 500 Georgians had taken up Kemp’s offer.

Kemp has not detailed his thinking process on the Senate appointment. A spokesman said the governor has not set a timeline for his decision

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But Georgia Republicans and those familiar with Kemp’s thinking say he is weighing two potential paths: He can choose a conventional route with a known and tested elected official, or he can move outside the box and choose someone who has never held public office before.

Two top Kemp allies applied late in the process, just hours before the deadline. One is Robyn Crittenden, the commissioner of the Georgia Department of Human Service, who briefly replaced Kemp as secretary of state. Another is Allen Poole, who runs Kemp’s Office of Highway Safety. Either Crittenden or Poole would be Georgia’s first African American senator.

Newt Gingrich Newton (Newt) Leroy GingrichMORE Two other candidates are likely to grab Kemp’s attention: Jackie Gingrich Cushman, an author of several history and political books and the daughter of former House Speaker(R-Ga.), applied early in the process. And Kelly Loefeller, a wealthy Republican donor who runs a financial services firm and co-owns the Atlanta Dream WNBA franchise, threw her name in the ring at the last moment.

“I have long considered how I can give back to our country through public service,” Loefeller wrote in her application. “It is important — now more than ever before — to have leaders with significant life and business experience outside of politics representing Georgia families in Washington, D.C.”

Kemp’s spokesman declined to detail the governor’s thinking on the appointment. But several sources said Kemp is leaning toward an outside-the-box pick.

Republican strategists are conscious that the appointee would immediately need to mount a reelection campaign in a state that has emerged as an electoral battleground, potentially favoring someone who could fund their own campaign or who would begin with a strong fundraising base.

There are signs that Kemp’s eventual pick might not have a clear shot at the Republican nomination next year. Collins told The Atlanta Journal-Constitution on Tuesday that he might run even if he doesn’t get the nomination.

“In recent days and weeks, I’ve heard from more and more Georgians encouraging me to pursue statewide service. Those Georgians deserve to have me consider their voices — so I am, strongly,” he told the paper

Though Democrats believe Georgia’s electorate is moving to the left, several top-tier contenders have opted against running either for Isakson’s seat or against Sen. David Perdue (R) next year. Those who have announced campaigns — including 2017 congressional nominee Jon Ossoff (D), businesswoman Sarah Riggs Amico (D) and former Columbus Mayor Teresa Tomlinson (D) — have all opted to challenge Perdue.

Only one Democrat, businessman Matt Lieberman, has formally said he will run for Isakson’s seat.