By Jon Blistein Savannah Guthrie pleaded for someone to “do the right thing” in a preview of a new interview on Today, the anchor’s first since her 84-year-old mother, Nancy, was abducted from her home. Nancy was reported missing on Feb. 1, and extensive searches and investigations have turned up no hard leads. Guthrie said she and her family are still “in agony” and called the situation “unbearable.” Of her mother, Guthrie said she wakes up “every night in the middle of the night” and “in the darkness I imagine her terror.” She continued: “It is unthinkable, but those thoughts demand to be thought. And I will not hide my face. But she needs to come home now.” Guthrie’s full interview on Today will air in two parts starting tomorrow, March 26, and continuing on Friday, March 27. Guthrie last appeared on the show on Jan. 30, two days before Nancy was reported missing. She made a brief return to New York earlier this month to visit the show and thank her colleagues for their support.…