Final answer:
The 12th Amendment altered the Electoral College by changing the voting process for electors, separating the votes for president and vice president to prevent ties and align with the political party system.
Step-by-step explanation:
A constitutional amendment altered an aspect of the Electoral College by changing the voting process for electors. This significant change was brought about by the 12th Amendment in 1804. The original procedure set in the Constitution allowed each elector to vote for two candidates, with the candidate receiving the highest number of votes becoming president and the second highest becoming vice president. However, this system revealed flaws when Thomas Jefferson tied with his vice-presidential running mate, Aaron Burr. The 12th Amendment rectified this issue by separating the vote for president and vice president, ensuring that a tie of this nature would not occur and streamlining the process to align more with the evolving political party system.