The WWJD (What Would Jefferson Do?) School of Constitutional Interpretation has reared its ugly head again in the 2010 campaign. Preachy proponents of the preposterous view that Thomas Jefferson's sentiments expressed in a letter to Baptists written years after the writing of the Constitution are somehow binding on Constitution interpretation are reported to be lecturing another candidate on how he should ignore the plain language and the clear intent of the First Amendment in favor of the secularist view that the First Amendment means exactly the opposite of what it says.
This time, it's happening in Denver, Colorado.
If you are worried about being accosted by one of these people (careful of being wrestled to the ground and having your head stomped on), just be sure to carry with you an actual copy of the Bill of Rights as well as a list of the states that had established religions at the time of the Constitution's signing.
Once they begin their sermon, just begin reciting it and chanting the names of the states. After they hear it several times, they will begin sputtering about "separation of church and state" as if it was part of the language of the Amendment even though its not.
After a few more minutes, they will begin babbling something about the 14th Amendment and how it somehow applied to the states the promise that established state religions would not be disestablished by Congress, resulting in exactly the opposite effect.
Keep reciting the Amendment and chanting the state names until they have become fully logically incoherent. As soon as they are laying there, panting on the ground, exhausted from their attempts to justify their position in the face of the rational, linguistic, and historical facts, just fold up your copy of the Bill of Rights and stick it in their pocket on the distant chance that they will actually read it and realize how bone-headed their position is.
It's all you can do.