Commercial Representation

I'm holed up in a guest room while I try to recover from an illness.
A few hours ago when I was channel surfing I wound up on C Span (pity me).
Anyway, a University of Maryland professor was delivering a speech about the government during which she referred to the legislature as "the two chambers of commerce" instead of "two chambers of Congress" three times. She immediately corrected herself each time, but it was a great slip.