Congress for kids:
At this site you can find several links to discuss not only elections but all sorts of interesting pages on how the government works.
PBS Learning Media:PBS: http://www.pbslearningmedia.org/content/#q=election&go=
This site has some great information about the elections. Click on the left panel for materials at your grade level
Time for Kids online:
This site also has some educational links with child-friendly information about the election.
From Teacher Vision comes this website of numerous links to lead you to election materials appropriate for your classes.
Scholastic online: Election 2012
This site is chock-o-block full of interesting links about the election for different grade levels and interests.
Brain Pop Jr.:
Go to: thepbs.org > Ed 1 Stop > School Help tab > Brain Pop Jr. > Use the keywords: "election" or "president" or "branches of government" to find short video clips about the election.
Go to: thepbs.org > Ed 1 Stop > School Help tab > Brain Pop > Use the keywords: "electoral college" or "election" to find short video clips about the election.