“Congressman is the trivialist distinction for a full grown man.”

Barely funny enough to get a smile. I'm sure he's referencing the Congressman that is doing the least is doing the best. If the Congressman is performing his duties in a representative republic, in pursuit of protecting his sovereign employer's rights, his distinction is not trivial. If the Congressman is representing a statist theocracy that claims inherent right as an organic hegemony, the graft, destruction, and otherwise criminal activity is not trivial either.

Maybe but still a powerful position.

I don't think this quote is truly one by Twain. If it were we would have become familiar with it. And for reasons Mike wrote he was too smart to make such a statement.

Sure, it sounds like a Mark Twain quote, but if it is, it's probably taken out of context. He was known for making fun of pretentious government titles of which Congressman is not. That makes me doubt the authenticity of the quote.