The author of the upcoming "Jewish Ethics & Social Justice: A Guide for the 21st Century" (March 2012) makes a case for faith-based, social-justice-driven voting in this year's election:
http://www.thejewishweek.com/features/street_torah/american_jewish_vote_not_a...

More on Rav Shmuly's forthcoming book @ www.jewishsocialjustice.com