The whole column is excellent, and you should read the whole thing, but this is key:
“Obama’s journalistic supporters live in a bizarre alternate reality in which a politician’s actual words mean nothing. When the president says something foolish and offensive, he didn’t say that. Meanwhile every comment from a Republican can be translated, through a process of free association, to: ‘We don’t like black people.'”
from Jim Geraghty in the WSJ.