They stand at 9-under-par 135 alongside Tom Scherrer (67) and Kevin Durkin (71). Chad Collins (13 holes), John E. Morgan (11), David Peoples (11) and Camilo Villegas (seven) are also at 9 under.
The second round was delayed for nearly three hours due to inclement weather. There was also a 17-minute delay during the round to clear some standing water on the 17th tee of The Dominion Club.
The round was eventually suspended for the night due to darkness. Second-round play will resume at 7:30 a.m. ET Saturday. The cut will be made at the end of the round and the third round will start at about 10:30 a.m.
McCallister played the back side first Friday. He picked up a birdie on the 10th and another on 15 to get to minus-8. After stumbling to a bogey on the 17th, the five-time winner on the PGA Tour carded birdies on one and four to get to 9 under. He parred out to remain there.
'The last two days, I've played some good golf,' McCallister said. 'Today it felt like the course played 7,600 yards, while yesterday it seemed like 6,600. It was a whole different course.'
Daley also got going on the back nine. He carded one bogey to go with three birdies over his first nine hole to make the turn at minus-8. On the front nine, the 44-year-old bogeyed the first, but then birdied three of his next four holes. He fell back to 9 under with a bogey on the seventh.
Scherrer birdied three of his first six holes from the 10th to start his round. He faltered to a bogey on 16, but got that stroke back with a birdie on 18. The two-time winner on the Nationwide Tour birdied two and four to share the lead. He parred his final five holes to remain there.
Durkin, who shared the lead after round one with Morgan and John Elliott, opened with birdies on the fourth and fifth to move to 10 under. Durkin stumbled to a bogey on the seventh and another on 13 to fall behind the leaders. He got one shot back with a birdie on 14. He parred the remaining four holes to share first.
'Battling the elements is the best way to describe what we went through this morning,' said Durkin. 'It was just a nasty day all around.'
Collins reeled off three straight birdies from the fifth to get to 10 under. He bogeyed the eighth and parred his next five holes before play was halted for the night.
Morgan has notched 10 pars and one birdie over his 11 holes, while Peoples has two birdies and nine pars through 11 holes.
Villegas, who tied for third place last week at the Rheem Classic, opened with back-to-back birdies from the 10th. After a double bogey on the par-4 13th, Villegas birdied 14 and 15. He parred the next before played was called for the night.
Robin Freeman, Bill Haas, Derek Watson, Martin Laird and Jason Enloe all finished their rounds and are one stroke behind the leaders at minus-8. Jason Gore and Nathan Green are also at 8 under par, but are still on the course. There are eight more players two shots off the lead.
Elliott, who shared the first round lead, struggled to a 3-over 75. He is tied for 27th at 5-under-par 139.