I did a little math:
Assuming ND loses and falls behind Oregon, we gain in two polls, but Oregon gains in six. If both KSU and Oregon pass ND in all polls (and no other teams move), our computer ranking would go from .940 to .960, while Oregon's would go from .850 to .890. That would give Oregon a .0048 point lead over us, assuming the poll gap stays consistent. .0048 BCS points translates into approximately 7 coaches poll points OR 14 Harris Poll points that we would need to close the gap.
What happens to Florida is almost as important as ND, really.