Deer Towed,
Our system has several problems built into the design:

(1) Our federal legislators are constitutionally protected from any action for ANYTHING they say in their debates or speeches in the halls of Congress.
(2) They are answerable only to the voters of their voting districts. Even if convicted of criminal offenses, they can be re-elected and serve, so long as the rest of Congress do not cast them out.

I haven’t heard of any cases, but I wouldn’t be surprised if there have been Congressional Representatives who were elected after felony convictions, who then served their terms from a cell.

Seems redundant these days.