Obviously, we ought to start with the GOP Hero, Ronald Reagan, who vetoed the thing in the first place.
Then, in addition to the obvious opponents like Goldwater, Strom Thermond and Jessie Helms, the veto was also opposed by:
So, if you hear any of these folks morning the passing of Nelson Mandela, remember, when they had the chance to vote on it, they voted against pressuring South Africa to free him. Unless it comes with a heartfelt apology, any statement from these men deserves laughter and scorn.
For more detailed viewing, here are the rollcall votes from the veto override.