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It seems inappropriate for most bloggers to be in political campaigns at this time.
Some of my favorite bloggers go through a cathartic process of shooting from the hip, hopefully with qualifiers, and then gradually refining their thoughts while gathering input off the web and from readers, to arrive at a more considered opinion. That's similar to the process all writers go through, usually in solitude, but bloggers do it in real time with a group.
That's part of the stream of consciousness style of blogging, which I like, but it does leave many unfortunate quotes in the public record.
A political candidate doesn't want to be playing defense and lecturing the voters on how to appreciate a stream of consciousness blogger, explaining the blogger's position and evolution, while meanwhile the opponent is dropping bombshell quotes.
I'm not surprised Marcotte was let go. I'm surprised she as a volatile blogger was ever hired to be part of a political campaign.