Sometimes there are committee members who have special powers or lack of power. If a member can pass any measure he or she wishes without needing anyone else to vote with him or her, then we call him or her a dictator. Thus member x is a dictator if and only if {x} is a winning coalition. A somewhat weaker but still very powerful member is one who can by himself or herself block any measure. If x is such a member, then we say that x has veto power. Thus x has veto power if and only if {x} is a blocking coalition. Finally if x.
