Looks like Ralph Hall to me. (fmr US Rep. TX 4th dist)
You probably are right.
IIRC he was there to stump for Cochran.
He unfurled that flag on stage, part of the sham to show that Cochran was a 2nd amendment Conservative type.
Then of course the eGOP called on the dems to vote the old traitor back into office.
What with all the fraud and cheating, a law suit was filed to remove fraudulent voted but was thrown out.