While I agree it is better to not vote if you have no clue, I think that it behooves you to do a bit of research and to vote. You can typically get a voters pamphlet that contains written statements from the candidates or their offices which will give you brief information. For those positions where you are still unclear, they typically list where you can get more information. The problem is, even if you see a lot of information, most of it nowdays is smear campaign or complete bias.
In short, don't vote blind, but do vote.
ps. if you realize at the polls that there is something going on that you don't know something about, you can always leave that one blank.