Yes. There has been a soup on the menu since the mid 1800’s.  A particular bean soup, a white bean, is on the menu in the Senate’s restaurant every day by mandate. 

There are several stories about the origin of that mandate, but none has been corroborated.  According to one story, the Senate’s bean soup tradition began early in the 20th-century at the request of Senator Fred Dubois of Idaho. Another story attributes the request to Senator Knute Nelson of Minnesota, who expressed his fondness for the soup in 1903.