The text of the speech from which the Quayle quote might have
been paraphrased is in Paul Fatout, Mark Twain Speaking.
[University of Iowa Press, Iowa City, 1976,] page 94
"Introductory Remarks [Spelling Match, Asylum Hill
Congregational Church, Hartford, May 12, 1875]".
According to Fatout, the church made $600.

See also the Hartford Courant, May 13, 1875. "Spelling Match
and Festival."