Wow! Thanks for all the great responses. The Interfaith Alliance site looks helpful and hopeful. Maybe my church can do a voter registration project.
I do have an issue, though. While my theology tells me that all religious traditions can be valid paths to spiritual fulfillment--to God--the ex-political hack in me says that the public message that's lacking is that Christians in particular can be liberal. And not just weakly identified, nominal, cultural Christians, but passionate, strongly commited Christians. The issues of religious tolerance or the separation of church and state don't address this. Not to get too partisan, but it seems to me that a "Christians for Kerry" sign at a rally would send an interesting message that a "One Nation, Many Faiths" sign does not. But does this exacerbate intolerance towards non-Christians?