How can we really measure?

According to the lastest sws survey released last march 2010, bistek ranked 1st with 73% rating...and 2nd is mike defensor. In my opinion, with all the things that is happening riught now like black progandas that they are throwing with each other, does this survey really credible as basis of who's leading and whose not. I have some friend that i talked with past few days ago, we are talking about the candidates here in qc, they are really not happy with bistek's pluder case, they told me that it is enough, it is a picture of what will bistek do if he won the as the mayor of qc, as for mike defensor i am reading blogs and polls in the net and they are not really happy about mike defensor. The main reason is the fact that he is Gloria's pet. He is clealy controlled by her. I mean...honestly? he is..right? Let's talk about the pother candidates... Annie susano and Mel Mathay... Lately there are rumors that mel mathay is backing out but it was corrected right away..i read his statement in the newspaper and clearly is a propaganda against hmi....as for annie susano...i don't know anything about her because her campaign is not really aggressive...But that's not a good thing either... I am wondering...how can we really measure?