Chattman91 saidIt's a shitty movie with the same message as "Radio", "The Blind Side", and "Avatar".
LOL, Avatar? That's so random.
What you're referring to (I think - who the hell knows!) is the Hollywood archetype of the "magic negro" which is predominant in the works of Stephen King (The Shining, The Green Mile, etc) and other movies like The Legend of Baggar Vance. I believe the phrase was coined by Spike Lee (or he popularized it), and it refers to African-American characters who appear out of nowhere to help the white protagonists, often with magical or larger-than-life abilities. They typically die or disappear at the end.
Sorry, but The Help is not one of those movies. The African-Americans in the movie are rich, well-rounded characters with fully developed backgrounds, and the plotlines of the movies follow them more than the white characters. (If anything, some of the white characters in The Help are relegated to broad stereotypes.) To suggest that the African-Americans in The Help are props to shore-up the white characters simply because they work for them belies both a lack of analytical thinking and knowledge of history.
PS: Yeh, Radio and The Blind Side both fucking suck.