If you think your four year old is going to respect the amazingness of Why We Can't Wait, then you're a fool. And while Goose did sit and do my hair and listen while I read her "Letter from a Birmingham Jail", I had to stop and explain even some of the simplest concepts like "injustice" fairly often, so an impactful line like, "injustice anywhere is a threat to justice everywhere" was lost. I was just glad to read it though and Goose did make my hair look extra beautiful.
Dean Koontz's Martin Luther King poem from Every Day's A Holiday was much better for both Goose and Monkey to sit through--and both of them did on several occasions (though the whole thing takes about thirty seconds to read).
We really don't watch much tv or movies, so Goose is a zombie in front of any film and sat through Martin Luther King's famous speech. When I asked what she thought she said "he talks funny but he doesn't hurt my ears".