It still seems no different to me: If you have to pick from two people, you have to base it on something. In RL elections if you know nothing about one candidate, you can very well vote for the other who might be a little bit more familiar. Or you could read some questionnaire results that are aplenty before the election, or watch some TV shows where they put the candidates against each other.
However, what's the difference compared to here? The candidates in these contests have posted in these threads, which is equivalent to those preelection campaign infos Animeniax referred to. The personal experience would be mainly from times before these contests, from the forums or irc. In real life you might have followed how the candidate behaved before that particular election for years in previous posts, and this is what I was referring to: I have no great interest in politics and basically the presidential elections have been the only ones where I really thought I knew something about some of the candidates beforehand (well, in that sense my example was dumb, I'll give you that, SK, I should have picked up some less grand election instead as an example. I guess everybody knew Bush and Al Gore beforehand in the US).