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A Northerner who sided with the South in the US Civil War, especially a member of Congress who supported slavery.
[Coined by John Randolph (1773-1833), American plantation owner and Congressional representative from Virginia who condemned the cowardice of Northern politicians who abetted the spread of slavery despite their abolitionist principles by likening such politicians to people wearing masks of dough who are frightened by their own appearance : dough (in reference to the masks made of dough worn by mummers in traditional American celebrations) + face.]
1. a mask made of dough
2. (Government, Politics & Diplomacy) derogatory informal US someone who is easily moulded, esp a Northern Democrat who sided with the South in the American Civil War
(before and during the Civil War) a Northerner who sympathized with the South, or a Northern politician who was not opposed to slavery in the South.