"In a small television studio, one of the most awkward things you can do is vocalize really loudly," Mr. McKenna said. "For politicians, that carries over to other venues, even on the campaign stump."
Will Obama soar or bore on Sunday's King dedication? →
"We live in the age of Twitter," Mr. McKenna said. "If MLK was alive today, I'd like to think that he wouldn't have a Twitter feed."