what MLK wanted and what he got were 2 different things. He became a very powerful political force courted by all Presidents and many others looking to be elected and used his power to promote his agenda.He bacame so powerful thay he was investigated by the FBI.
Now to the caucus issue.
Caucus-a group of members in the House of Reps that share some commonality either personal(Hispanic caucus)district(Rural caucus) or substantial interest(congressional progressive caucus) Michelle Bachman just started the Tea Party caucus. There are over 100 different caucuses in the House. You may not like the idea of the caucus but to single out and question why the black reps need a caucus seems unfair and rather shortsighted on your part.