Charles Krauthammer has an essay up regarding the use of the F-word in let's face it, less than polite conversation including its use through 2 or more layers of auto glass and even on the floors of the U.S. Congress.
In the House, where the membership is often indistinguishable from the denizens of dive bars located in some of the seedier neighborhoods, there is less concern with decorum but in the senate, the suggestion should be sufficient.
In declining a members suggestion regarding legislation one should pointed refuse to go into any detail regarding his or her intelligence, personal habits, ot qualifications for the office, and then refer the errant member to other declination to participate put forth by long gone members far more loquaciously gifted than anyone currently warming a seat. One should ask that the member consider the older statement with only the phrase "and the horse you rode in on." appended.