Imposters.

Someone is commenting on other blogs using my name. What action should I take?

ADDED: I have contacted the blogger asking that the comments be removed. So far, I've received no response, and it is perhaps too soon to accuse the individual blogger of unethical behavior. I would appreciate some support from other bloggers, of all political stripes, making it absolutely clear that this is unethical.

UPDATE: The blogger in question, instead of answering my email or being at all decent about it, has indicated strong support for the imposter commenter and thinks the whole thing is just funny, including my objection. On the positive side, he's now used my name so much that it makes the fakeness obvious, and his behavior shows that he thinks of me as the sort of huge celebrity who gets imitated all the time and everyone knows is fake. As one of the commenters herein notes, I have said -- maybe just in a podcast -- that I have a strategy playing the blog game and, as he observes, this incident can be read as a sign of its success. Or, in saying that, am I trying to use reverse psychology on the blogger in question? If he thinks he's playing my game, maybe he'll stop. Or did I put up that last thing so he wouldn't stop?