This excerpt taken from the NKE DEF 14A filed Aug 3, 2007.
The Board of Directors recommends that shareholders vote FOR approval of the extension of and amendments to the Plan. Holders of Class A Stock and Class B Stock will vote together as a single class on Proposal 2. If holders of a majority of the shares of Common Stock vote on the proposal, Proposal 2 will be adopted if a majority of the votes cast are cast for the proposal. Abstentions are considered votes cast and have the same effect as no votes in determining whether the proposal is adopted. Broker non-votes are not counted as voted on the proposal and therefore have no effect on the results of the vote.