See first quotation.

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1888.  The “Spellbinders’” end of the Republican party in this vicinity had its innings of rejoicing last night. It took the form of a dinner at Delmonico’s, and there were just 111 “Spellbinders” present. Each one was a campaign speaker, and had in his time held an audience “spellbound,” or thought he had. Hence their title.—New York World, Nov. 15.

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1891.  And who, in Kansas at that time, was not an orator? I believe they call them “Spellbinders” in these modern, slangy, and degenerate days.—‘Kansas Hist. Collections,’ v. 52 (1896).

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1908.  Party spellbinders are lustily declaiming.—N.Y. Evening Post, Oct. 22.

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1910.  Lee Fairchild, a campaign “spellbinder,” newspaper and magazine writer, and “man about town,” died on Saturday morning at Roosevelt Hospital of pneumonia.—Id., March 21.

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