history that an elector had cast a vote for the same person to be both president and vice president; another faithless elector in the 1800 election had voted twice for Aaron Burr, but under that electoral system only votes for the president's position were cast, with the runner-up in the Electoral College becoming vice president (and the second vote for Burr was discounted and re-assigned to Thomas Jefferson in any event, as it violated Electoral College rules).
What is different in comparison between the 1800 electoral system and the system in place in 2004?
under that electoral system only votes for the president's position were cast, with the runner-up in the Electoral College becoming vice president