On the ever growing list of contenders for the chairmanship of the Democratic National Committee is former California party chairman Nancy Pelosi, who is the daughter of former congressman and Baltimore mayor Thomas D'Alesandro Jr. Her brother Thomas D'Alesandro III was also mayor of Baltimore . . . The National Gallery of Art is looking for a top-level executive manager to help gallery director J. Carter Brown in fund-raising and in the growing administrative demands. In the 15 years that Brown has run the national collection, the staff has expanded from more than 200 to nearly 900 . . . It was an odd reason to hold a party, but a group of radio personalities who had all once worked for William Tanner Jr. at WASH-FM held a reunion at Mel Krupin's to celebrate having been told to find employment elsewhere. Among those making a toast to "Tanner, who made us what we are today," were John Bodnar of KIX Country; Jerry Clark, WTKS-FM; Bob Duckman, WXTR-FM; Dave Arlington, WLTT-FM; Eddie Gallaher, WWDC-AM; and Walt Starling, traffic reporter for WPGC-FM . . . New York City's landmark Dakota apartment building, where John Lennon lived (and outside which he was killed), is 100 this year. Some of the rich and famous, like Yoko Ono, Leonard Bernstein and Roberta Flack, live there . . . Mickey Mouse celebrated his 56th birthday at Disneyland yesterday with some of his old friends from the original Mouseketeers present. Do you remember these names? Darlene Gillespie, Don Grady, Bonnie Lynn Fields, Lonnie Burr, Tommy Cole, Sharon Baird, Sherri Alberoni and Cubby O'Brien . . .