I have had the past experience of having people comment that they enjoy my blogs except my political ones. I then asked myself the question "Do I let a person's politics affect my opinion of the person over all?" In general, the answer would be no. However, I think in the blog world it depends on what my initial experience is with the blogger in question. If my first experience is a negative political blog, I might form a hasty opinion that will be difficult to change.
I have plenty of friends and family who differ in political leanings than I. I have noticed that some seem to think if someone doesn't agree with their politics it means that person is inferior in intellect or is simply misinformed. I don't feel that way at all. If someone educates themselves and comes up with a well based opinion, I have no reason to feel my opinion is superior.