Never too early to begin voting. He should have won it last year. Other than the Heisman, this is probably the best post season award a college QB can receive. Cam Newton won both last year with Kellen and Luck hanging in till the end. The O'Brien is heavy on good character and off field stuff, as well as on field performance, so the Newton win was a bit of a stretch (heavy sarcasm here), though the vote was closer than the Heisman. The fan input is one part of the process.
Go here http://www.voteobrien.org/login.asp register and vote. You can vote once per day. Kellen is in the lead after the first day!