This Nation
This nation.com: Electoral College
A textbook excerpt from ThisNation.com that includes a useful chart of electoral votes by state. Clickable links to pertinent articles and amendments of the Constitution are another plus.
Independence Hall Association
U.s. History: The Expansion of the Vote: A White Man's Democracy
Read about how the ability to vote changed from requiring the ownership of property to almost complete enfranchisement of white males by 1840. There was disenfranchisment of women and free blacks in the same period of time.
New York Times
New York Times: Crossword Puzzle: The Electoral Process
Twice a month you can play a new crossword puzzle on The New York Times Learning Network. This one is called "The Electoral Process."