From a Seneca County, New York newspaper in September 1862:
McClellan Club.
The undersigned hereby form themselves into a Club, to be known as the “McClellan Club of Seneca Falls,” to [be] organized to support “the Constitutio[n,] the Union, and the enforcement of t[he] Laws.”
The first meeting of the Club will be at Concert Hall, on the 29th of September, 1862, at 7 1-2 o’clock P.M.
[the names of 61 men.]
It is said that George B. McClellan supported Democrat Stephen A. Douglas in the 1860 presidential campaign. It would not surprise me if some of the 61 members who were organizing the club were involved with The Little Giants during the 1860 campaign.