because repugs love their hypocrites!

Sen. Ensign: "I Fully Plan On Running For Reelection"
(Huffington Post)
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And they can only be removed by legal means - there is no hypocrisy that can embarrass them enough to voluntarily leave office.
Case in point:
John Ensign Linked To "Do-it-Yourself Exorcism" Movement
(Huffington Post)