[+/-] Is blogging protected by the First Amendment?

Traditional journalists in America have been protected from revealing their sources. 31 American states protect journalists by offering a limited legal privilege: reporters can be subpoenaed only if the evidence sought is essential and otherwise unobtainable. In practice, this privilege is generally observed, but who is a journalist? Define "journalist" too narrowly, and free speech is unacceptably restricted; define it too broadly, and any witness to a crime can simply sign up as a freelancer to avoid testifying.

Are bloggers journalists? Should bloggers have this same immunity? Discuss.