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Senators take this oath upon entering office:

I do solemnly swear (or affirm) that I will support and defend the Constitution of the United States against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge the duties of the office on which I am about to enter: So help me God.

But they apparently forget it immediately; even sometime firebreathers like Patrick Leahy sure would rather let the chips fall where they may, let nature take its course, et cetera, than actually "defend the Constitution." Why, that might require courage, diligence, discomfort -- might even harsh the mellow in the world's greatest deliberative body.