This would be for the sake of the “objective” media (which often but not always) goes to ridicule the rallies (Village Voice media is openly hostile to these patriot groups).
They may be able to express “shock” and “disbelief” that any group (like TCCP) would ever DELIBERATELY pose as tea partiers, but they would not be able to deny having ANY knowledge (with that handout of exposure in their hands).
Such foreknowledge makes the media complicit in the lies they spread.
Another possibility would be to carry signs that are racist or highly offensive but have organizations like ANSWER or crashtheteaparty.org on the bottom of the sign just big enough to clearly see on TV cameras. (This will take a bit of experimentation.) And then act like Levin, completely over the top. That is, infiltrate the infiltrators.