Quote!

806. Emotional factors tend to make us select evidence we like and neglect evidence we don’t like. Such an emotionally based partial selection clouds our view of reality and is an error in thinking. BERNARD M. PATTEN, Truth, Knowledge, Or Just Plain Bull: How To Tell The Difference, 2004.

This relates to a lot of things that we have talked about in relation to persuasion. For example, when Mr. Behler talked about the Nixon v. Kennedy election, he said that even though Nixon was so straightforward, that Kennedy was suave and sexy, and we were more drawn to him, even of we didn't agree with what he had to say. Our emotional connection with his smooth talk and smooth look made us reject the fact that maybe we didn't agree with what he was saying and vote for him anyway.
Another example is when someone has a crush on someone. There's a quote that goes "When you develop an infatuation for someone, you always find a reason to believe that this is exactly the person for you." This is because you're so emotionally attached to someone, you block put all of the things that may be wrong with for you (relationshipt-wise) and focus on all the things that you feel would e perfect about the two of you. Then you get hurt either because things didn't work out exactly the way you had planned or didn't work out at all.
Another example is when you decide that you just really don't like someone. It then appears that every single thin that person does is incredulous and uncalled for. They could've just saved a baby from being run over, and somehow you could find a way to have something be wrong with that, so thy the person looks bad, like "They were just doing it to show off."
Your personal bias do tend to cloud your view of something, an essentially never truly give you a true view of anything. you're mind always clouds what is truth to fit something you really want it to be.