organization. the united states is hopeful a special envoy to north korea will secure the release of american prisoner kenneth bain. u.s. ambassador robert king and a small delegation will fly to pyongyang this weekend with the sole purpose of trying to free him who's been held since last year for supposedly committing hostile acts. when we come back, a rousing tribute to dr. martin luther king jr. 250 years after his iconic i have a dream speech. oprah, two former american presidents as well as the current president of the united states. they commemorate this historic day. he little tiny chipmunks go all the way up... ♪ [ female announcer ] when your swapportunity comes, take it. ♪ what? what? what? [ female announcer ] yoplait. it is so good. what? what? everybody has different ideas, goals, appetite for risk.