Ask HN: Google search correction

I don't want to get political, but I am a bit worried about how Google is (indirectly) censoring some of the searches. A conservative friend of mine noticed that when you searched "Clinton for prison" it would underline prison in red, as if it is a misspelling. I found it odd because I could put in just about every other word combination I can think of and it seemed ok. It was almost like the algorithm was "if starts with 'clinton for'" then 'prison' is not a word"... Anyone have any insight on this? Perhaps it is just a coincidence?