A leader leads. that means making decisions and following through with them. acting on the group vote only makes you a representative- not a leader! being a leader takes 2 things- brains and balls. As far as that "team player" crap, every team has coach. that is the team's leader. the team looks to him/her for direction. that's what leading is. if the coach stopped to ask what everyone else thought, he/she would be a terrible coach. again a leader leads- otherwise you're just the sheep at the front of the herd!
I think that goes against the idea of a leader in the first place. A leader is designed to lead the group, not the group to lead the leader, if that was the case then why would they have the leader in the first place, get what I'm saying Renee? :) I think though, that the leader should take an informed position on what the group wants and then use that as one of the basis by which he or she makes his or her decisions. Yeah that's just my opinion, you're welcome to disagree!
If the majority opinion always mattered most, there would be no need in having a leader. I think leaders are chosen for their qualities in good decision making and being able to stand up against the crowd when needed. Not saying the majority opinion is void though... A good leader will listen to the majority and to the minority and make a decision based on what he/she thinks is best.
I think that leaders should always try and follow with the consent of the majority. The word 'leader' implies that there is a group to lead, a team perhaps. If the leader is always doing what he wants/feels is best, then he's not being much of a team player.