Chris Couch carded the round of the day as he shot a 9-under 63 to climb into a share of third place. He is joined at 11-under-par 133 by Patrick Sheehan and overnight co-leader John Senden.
Frazar opened on the back nine and stumbled to a bogey at the par-5 11th. He bounced back as he holed a sand-wedge from 110 yards out at the par-4 13th to get to minus-8.
Frazar, who is looking for his first PGA Tour title, rolled in a birdie at the 16th. He made it two in a row when he converted a birdie at the 17th. He then ran off five straight pars around the turn.
The University of Texas alum jumped to 12 under when he eagled the par-5 fifth. He tripped to another bogey at the next, but bounced back to birdie the seventh for a share of the overnight lead.
'The two bogeys I made were because I was playing aggressive,' said Frazar. 'I hit decent shots, but tried to throw them too far behind the flag. I'm making a lot of birdies and I'm making some good putts so hopefully they will continue going in.'
Pate opened with a birdie at the par-3 second. He climbed to 7 under with a birdie at the par-4 fourth. He parred the final five holes of the front nine before turning it on on the back nine.
The 43-year-old Pate rolled in a birdie at the 10th and came right back with a birdie on 11. He moved to minus-10 with a birdie at the 13th.
Pate, who owns six PGA Tour wins, parred his next three holes. He then converted back-to-back birdies from the 17th to grab a piece of the 36-hole lead.
'I played well all day,' Pate said. 'I have been driving it a lot better. I haven't done real well here in the past because I kept hitting it in the rough. I've driven well though for two days.'
Glen Day, who shared the first-round lead with Senden and Frazar, managed a 1-under 70. He shares sixth place at 9-under-par 135 with Pat Bates (66), David Morland IV (67), Loren Roberts (69), Jay Don Blake (67), Greg Chalmers (67) and Robert Damron (65).
U.S. Ryder Cupper Fred Funk and Woody Austin lead a group seven players that are one stroke further back at minus-8.
The cut line fell at 4-under-par 140. Exactly 70 players made the cut. Among those missing out on the weekend were Brett Quigley (141), Niclas Fasth (142) and 2003 champion John Huston (143).