This kind of behavior is unacceptable when conservatives do it, and I for one find it equally repugnant when liberals do it. We're supposed to be above all that.
From the Orlando Sentinel:
In fact, U.S. Rep. Alan Grayson of Orlando took such offense at a parody website aimed at unseating him that the freshman Democrat has asked that U.S. Attorney General Eric Holder investigate the Lake County activist who started the anti-Grayson website "mycongressmanisnuts.com."
Specifically, Grayson accuses Republican activist Angie Langley of lying to federal elections. His four-page complaint highlights the fact that the Clermont resident lives outside his district, but that Langley still uses the term "my" in "mycongressmanisnuts.com."
Come on Grayson, how petty can you be? The correct response is to ignore these jerks, not to lend them credence and mock the values for which you ostensibly stand.