This excerpt taken from the PDLI DEF 14A filed Apr 24, 2009.
How are votes counted?
Votes will be counted by the inspector of election appointed for the Annual Meeting, who will separately count FOR and Withhold and, with respect to proposals other than the election of directors, Against votes, abstentions and broker non-votes. Abstentions will be counted towards the vote total for each proposal other than the election of directors, and will have the same effect as Against votes. Broker non-votes have no effect and will not be counted towards the vote total for any proposal.