I have hard time understanding the term oily-Gammon in this sentence from How To Debate Politics Like A Gentleman.
Teddy Roosevelt would frequently lose his cool during debates on the Assembly floor. He’d call his opponents “cold blooded, narrow-minded, prejudiced, obstinate, timid, old psalm singing Indianapolis politicians” or “oily-Gammon, churchgoing specimens,” or simply “classical ignoramuses.”
The only meanings I can find for gammon are the following:
Ham which has been cured or smoked like bacon
A victory in backgammon (carrying a double score) in which the winner removes all their pieces before the loser has removed any
What does oily-Gammon mean?