Dick Tuck, the Democrats’ prankster-at-large, who bedeviled Barry M. Goldwater, Richard M. Nixon and other Republicans with bad-news fortune cookies, a comely spy, a treacherous little old lady and other campaign-trail tomfoolery, died on Monday in Tucson. He was 94.

His death, at an assisted living facility, was confirmed by Lorraine Glicksman, a close friend.

Long retired as a Democratic National Committee consultant, strategist and advance man, Mr. Tuck was a king gremlin of political shenanigans, starting in California in the 1950s and needling G.O.P. rivals for decades. Dogged by Mr. Tuck most of his political life, Nixon can be heard on Oval Office tapes enviously praising Tuck exploits over his own team’s crude (and illegal) dirty tricks.

“Nixon was an admirer of mine,” Mr. Tuck said in a telephone interview for this obituary in 2013 from his home in Tucson. With unconcealed glee, he recalled many pranks and quoted Nixon on the tapes as saying: “Tuck did that and got away with it” and “Shows you what a master Dick Tuck was.”

On the morning after the first televised presidential debate between Nixon and John F. Kennedy in 1960, Mr. Tuck enlisted an elderly woman to sidle up to Nixon in Memphis. Wearing a big Nixon button, she hugged him and cooed as television cameras rolled: “That’s all right, son. Kennedy beat you last night, but don’t worry. You’ll get him next time!”