On tonight's Hardball, Chris Matthews pretty much allowed Howard Dean to slam Sen. George Allen without challenging him on his assertions. Asked about Allen, Dean said that he served with Allen while they were both Governors and that Allen "doesn't belong in public service." Dean also said that Allen "always shooting from the hip, he never thinks through what he means, and he caters to the wrong instincts in people" of which the "macaca" incident is supposedly proof.
Video available here.
Matthews did ask Dean if he knew what "macaca" meant but did not ask Dean if he knew what it meant before this incident, which seems like the more obvious question to me. My bet is that he didn't have a clue much like the vast majority of people in this country including, perhaps, Allen himself.