Jackson - David Toms fired six birdies in a six-under-par 66 on Friday to seize a share of the lead alongside John Rollins in the PGA Tour event at Country Club of Jackson.
Toms, whose 13 PGA Tour wins include the 2001 PGA Championship, had a 36-hole total of 10-under-par 134.
Rollins also posted a 66, his coming with eight birdies and two bogeys.
They were two strokes in front of Canadian Nick Taylor, who carded a second-round 69.
It was a further stroke back to Tom Gillis (68) and Robert Streb (70) on 137.
Toms posted his low score on a chilly morning playing alongside fellow former major champions Lucas Glover and Padraig Harrington of Ireland.
Glover, the 2009 US Open winner, carded a 67 that put him six-under for the tournament while Harrington, whose three major titles include back-to-back British Opens in 2007 and 2008, carded a 69 that left him five shots off the lead.
"We probably had more conversation than I've had in a long time, just mostly small talk," the 47-year-old Toms said of the group. "But we have a lot in common, have played a lot of golf together, all three of us. We had a good time."
Toms is seeking his first win since 2011, the same year Glover captured his last title.
Toms said keeping the ball in play was the key to his two rounds without a bogey.
"I've been real patient with my iron shots," he said.
For the second straight day play was halted by darkness, with 15 players still on the course. They were to return Saturday morning to complete the round, with the third round to follow.
Overnight leader Sebastian Cappelen of Denmark had two holes remaining in what had been a difficult round.
He was three-over for the day through 16 holes to fall into a share of 21st place in the $4 million tournament.Leading scores after Friday's second round of the PGA Tour's
Sanderson Farms Championship (USA unless noted, par-72, play halted by
darkness, to resume on Saturday):
134 - David Toms 68-66, John Rollins 68-66
136 - Nick Taylor (CAN) 67-69
137 - Tom Gillis 69-68, Robert Streb 67-70
138 - William McGirt 68-70, Shawn Stefani 70-68, Lucas Glover 71-67, Vaughn Taylor 72-66, Boo Weekley 70-68
- Charlie Wi (KOR) 68-71, Padraig Harrington (IRL) 70-69, Garrett
Osborn 70-69, Jason Kokrak 69-70, Michael Thompson 71-68, Jason Bohn