Here is a list of useful links :
Electoral Process :

“Electing a US President in Plain English”

“Brain Pop : presidential election (animation + quiz)”

Candidates biographies :

“Romney Bio Package Narrated by Shepard Smith”

“President Barack Obama Biography”

Programmes / Campaign :

“2012 Presidential Candidates : Where they stand on the Issues”
“Campaign video : Crossroads GPS basketball”
Eva Longoria DNC Speech

Miscellaneous : Issues at stake, programmes, biographies, pictures …
“BBC News US Election”

Election Vocabulary : “englishpage.com/vocabulary”