Ohio State is tied for the 2nd best odds to win the National Title, tied at +450 with Georgia & Texas and behind only Oregon at +350.

Oregon +350
Ohio State +450
Georgia +450
Texas +450
Notre Dame +900
Penn State +1000
Tennessee +1800
Alabama +2200
SMU +3000
Clemson +5000
Indiana +5000
South Carolina +5000
Arizona State +8000
Boise State +10000

According to MGM