I had never heard of the chain until I went searching for the sense behind some OTR show references--
1930-- "Cliff and Lolly"-- a Negro dialect character, asked if he knows who George Washington is, says, "He's de man what's wife makes de candy."
1940-- George Burns, when asked what he'll do if Gracie becomes president, says (approximately) "I guess I can always start a candy store."
(not sure of date)-- Fred Allen show, someone says (about a hotel room maybe) "I think Martha Washington slept here-- I found two gumdrops in my bed."
Did Jack's show ever refer to Martha Washington candy?