The Seahawks were spotted 2.5 points, thus there can't be a tie, since a half a point can't be scored in football. Seahawks actually won this bet line 8.5 to 6. Go hawks!

Edit: Nevermind. It said in this post:

Please note: We have decided that the spread for this game will not affect your vote bets being that it is a close spread! With that being said, whatever team you pick... You will pick them to win without the spread!

Foolish choice, IMO. There should always be a spread with a half point to get around the possibility of these types of situations.