Heather McGhee, the president of the left-leaning research and advocacy group Demos, often begins her Sundays by giving her mother something to talk about. “She’s the person who has a lot of opinions about my appearance,” said Ms. McGhee, 35, a frequent guest on morning talk shows and on MSNBC. Besides doing on-camera stints, she likes a day without meetings, conferences or fund-raising talks, instead pursuing culture with friends. She lives in Greenwich Village with two cats.
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