Democracy, in today's society, is, and most likely will always be a popularity contest. It can work in a real world society because the person you are going to vote for is not the true person always running the show. They are just the representative put in the place to take the gratitude or the punishment of society for all the good and bad that happens.
On the internet and smaller communities, this is not something that works as a practical means. Its a glorified popularity contest. You don't have to do the right things, you don't have to show exceptional skills or judgment, all you need is for people to like you. The more people that like you, the better chances you have at winning.
This is also true in real world use, slander campaigns used by opponents attempt to lower the view on the target so that people like the other person. Promises are made that are never kept just to gain the love and adoration of the people whom they want the votes from. When you have a smaller community, this turns from a glorified popularity contest, into a full popularity contest. There isn't an accurate portrayal of what would be good and what would be bad.
In essence, using current real world examples, we could vote someone in who really won't give a damn about the forum in which they preside. They'll make bad decisions just to keep face and show that they are active in an area they wouldn't want to be, or could earnestly be super involved in that area, but make bad decisions on what to do with the area that they kinda kill off the discussions in their sections.
Any case where popularity or majority vote comes into play with small communities, you are asking to play with fire. It can work, it can cause a lot of trouble, it can utterly destroy what section the voted member is in charge of.
The easiest way to use Democracy on community forms is usually by community announcements to see the reaction and make decisions based on that, or polls to see what others would like. While this has its own problems, its more effective than open voting for adding people. Let those in charge make the decision and then let the people take their time and view/review what has gone on and make their decisions later. Not everyone will be liked, but you can get better results towards what's best for the community this way.
(I hate pink...wish we would have put this up to vote >.>)