Trey Radel doesn't have what politicians used to have. He has no shame. He isn't embarrassed enough by his conviction for buying cocaine to step down from his job as a Congressman. That's what is missing in this equation.
There used to be a much stronger party apparatus as well. By now, someone would have explained to him and his chief of staff that his resignation announcement would be delivered on a Friday afternoon and that he was to disappear. Not anymore. Everyone shrugs and no one cares. A Congressman on drugs? Who gives a damn anymore?