Stating the obvious: Imagine if you were a voter and you pledged to be as unbiased and impartial as humanly possible.
Also, there's only Four Teams on which to vote: OSU, Bama, FSU, & Oregon.
Do you put OSU in your top two? The only current ranked teams they will/have played are Wisky and most likely Mich St.
As of now... of course things can always change but the Big Ten currently sucks. The phrase 'The Big Ten is down this year' has been replaced by 'The Big Ten.' The Big Ten is slowly becoming 'OSU & The Mountain West of the MidWest'. Convincing wins over Ill., Indy, & Mich won't wow voters or the computers.
I'm the biggest OSU fan I know, but OSU is not in my top two. Hence, in my opinion, as of now, they are justifiably withheld from the championship game. Thus, I'm not upset at the rankings.