Exposing the Senate to ridicule over the impeachment process.
Pardon me, Bill, but I don't remember Clinton inviting the Senate to impeach him. In fact, the President never invits an impeachment...IIRmC (If I Remember m Constitution), it's the House that draws up the Articles of Impeachment, and the Articles are tried in the Senate.
No, Bill, I'm afraid you're going to have to look elsewhere for the source of Senate ridicule. There are plenty of usual suspects, but Bill Clinton ain't one of 'em.
Sorry, better luck next time!