re: moonbat
I would say it's a fringe leftist, in common web usage, although so much of the Demagogic Party has lurched toward the far left in their BDS ("Bush Derangement Syndrome") that it has gotten pretty tough to say where 'fringe' begins and ends.
In my usage, it's any leftist who is so blinded by hate and/or ideology that they cannot consider obvious facts in a semi-rational manner. We may still disagree at the end of the discussion about policy but at least there has been a serious attempt at rational discussion. With 'moonbat' leftists that is simply not possible. For the "Jersey Girls" I term them moonbats because of their despicable behavior surrounding the 9/11 Omission-Commission hearings, where they were totally uninterested in any objective inquiry to improve our national security and instead preferred to make themselves into political tools supporting the absurd proposition that all security vulnerabilities related to 9/11 were the fault of the Bush WH and none were related to the 8 years of the Clinton administration or the decades of dominance of the Demagogic Party in Congress and the MSM. For that sordid drama they are rightly called moonbats, but I would never suggest they enjoyed anything about their husband's deaths, etc.....
http://en.wikipedia.org/wiki/Moonbat The term was originally rendered as 'Barking Moonbat', suggesting that certain issues seem to trigger a reflexive response from some people much like wolves howl at the moon (i.e. the term evokes the traditional association between the moon and insanity). It now enjoys great currency in the conservative and libertarian blogosphere as an all-purpose label for modern liberals (in the American sense of the word), war protesters, and other ideological opponents. It is similar to the epithet Idiotarian and like that term can also be applied to people anywhere on the political spectrum (for example both terms have been used to describe US conservative Pat Buchanan).
According to de Havilland, a moonbat is "someone on the extreme edge of whatever their -ism happens to be". Adriana Cronin defines the term as "someone who sacrifices sanity for the sake of consistency". This term has long been used to describe protesters on the political Left, but was originally coined to also describe commentators on the political Right as well as certain libertarians.
Moonbat has frequently been used to refer to those who believe certain conspiracy theories. Examples include those who believe that elements in the US government orchestrated the terrorist attacks of 9/11 or that these were executed under the direction of Israel.
Lately the term has come into wider use appearing in political cartoons, political forums, and blogs, oftentimes as "moonbat crazy".