Unit Plan
US National Archives

Nara: u.s. Electoral College: u.s. Electoral College

For Students 9th - 10th
National Archives and Records Administration home page on the U.S. Electoral College. Contains details on historic voting patterns as well as technical details on procedures.
Interactive
Annenberg Foundation

Annenberg Classroom: Electing the President and Vice President

For Students 9th - 10th
Check out this interactive timeline of the history of electing the President and Vice President of the United States.