The free lesson plan "Making Choices: An Exploration of Political Preferences" [1] recently published in Middle Level Learning is available for download. The lesson uses summaries by ProCon.org [2], which tracks the candidates' statements on many controversial issues.
Links:
[1] http://static.ncss.org/files/publications/MakingChoicesMLL.pdf
[2] http://www.2008electionprocon.org/
[3] http://www.socialstudies.org/resources0
[4] http://www.socialstudies.org/lessons
[5] http://www.socialstudies.org/middlelevel
[6] http://www.socialstudies.org/secondaryhighschool
[7] http://www.socialstudies.org/powerauthorityandgovernance
[8] http://www.socialstudies.org/civicsgovernment