MLK Jr also knew how to stir a crowd. Was he articulate?

I gather, John Hardly, that 'articulate' to you means only #1 in this dictionary definition?

1. uttered clearly in distinct syllables.
2. capable of speech; not speechless.
3. using language easily and fluently; having facility with words: an articulate speaker.
4. expressed, formulated, or presented with clarity and effectiveness: an articulate thought.

To me, articulate has always denoted #3.

As far as not understanding someone's 'articulation' we have all known of people from various parts of the world- hey, from various parts of one's own country - who are hard to understand. Ask the Alabaman what the New Englander said.

A cultural difference is just another element.