Big 12 has lost two games in which they were favored (line was less than 4 in each), and won one in which they were not favored. In the other two wins, the Big 12 was favored once, and a pick 'em on the other.
I'd say the Big 12 is minus one right now, with 4 games left and we are only favored in one of them.
Iowa State +2 vs Tulsa
Ok State -17 vs Purdue
KSU +9 vs Oregon
OU +3 vs aTm