So I have a little free time on my hands...

A lot, apparently. Chris Good goes over past precedent where the 20 members crossed the line for their peers. Charlie Rangel was always safe, unless he angled for the Spanish territory in Louisiana. More at The Atlantic.

Then there are these CRS Reports:

Status of a Member of the House Who Has Been Convicted of a Felony (RS21196 April 15, 2002)

Expulsion, Censure, Reprimand, and Fine: Legislative Discipline in the House of Representatives (RL31382 Jan 25, 2005)

Expulsion and Censure Actions Taken by the Full Senate Against Members (93-875 Nov 12, 2008)

Recall of Legislators and the Removal of Members of Congress from Office (RL30016 March 26, 2010)