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whether it's to the less fortunate or just on an equal level, just giving back to other people out of the goodness of your heart. >> i think service is a mutual relationship. you're able to give something but you also get something back because you're learning from the community that you're serving in. >> reporter: and as dr. king's timeless message echoes through the generations -- >> this nation will -- >> rise up and live out the true meaning of its creed. ♪♪ >> reporter: a reminder that others stand ready to take up the mantle. blayne alexander, nbc news, atlanta. >> and that's "nightly news." for more on the iowa caucus results tune in to nbc news and "nbc news now" all evening. thank you for watching, everyone. i'm lester holt. please take care of yourself and each other. good night.