The Torchlight (Oxford, N.C.) (July 22, 1878) :

“Covering to protect his nominating friends from the foggy, foggy dew.”

Marion County [Kans.] Independent (Sept. 27, 1883) : “Or did they get lost in the foggy, foggy dew?”

Times-Picayune (N.O.) (Nov. 13, 1886) : “He was on this occasion left out in the foggy, foggy dew.”

Duluth Daily News (Oct. 4, 1887) [ref. to ca1875]: “Noyes…had a habit of singing and dancing (he weighed over 225 pounds) …’She never said a word when I took her in my arms, just to kape her from the foggy, foggy dew.’”

J. Wallace Hoff, Two Hundred Miles on the Delaware River (Trenton, N.J.: Brandt Press, 1893) : “Outside, the ‘foggy foggy dew’ was slowly drifting up stream, blown by a faint breeze.”

The Morning News (Wilmington, Del.) (Aug. 23, 1901) : “To keep you ‘from the boggy, foggy dew.’”

Bonus:
Salina [Kans.] Semi-Weekly Journal (March 15, 1889) p.1:

        Blow the winds of Kansas,        
        Blow the winds, hi ho,
        Blow away the foggy dew,
        And blow, winds, blow.