Obviously, this trick is right out of Saul Alinsky's playbook.
But it also means that ugly behavior by supposed tea partiers can't be taken at face value. And it poses a challenge to the integrity of the MSM: Will its members investigate those who engage in disgusting behavior -- to discover whether they're genuine Tea Partiers or actually leftists bent on destroying the reputations of those who disagree with them?
On the "Crash the Tea Party" site, there is a place for registration. I encourage fair-minded Americans -- including those in the press -- to check it out, and find out exactly what these opponents of free speech have in mind.
More than anything, however, the very existence of the site is an implicit admission that Tea Partiers are not the hateful monsters depicted by their adversaries (and, too often, the press). If they were, there would be no need for this kind of despicable cloak-and-dagger foolishness.
Update 4/12: Thanks for the link from Lucianne.com -- a site I love. The suggestion posted there with this item is a good one: Take a camera to the rallies and photograph anyone behaving in a way that suggests they're part of this "Crash the Tea Party" foolishness. That way, there's at least some hope that they can be subsequently identified.