Sen. Hillary Clinton suddenly morphed into Howard Dean last Saturday when she raged on about election conspiracies and "a brave new world of extremism" — sparking some Dems to wonder if she feels a need to protect her left flank. ....Maybe from Sen. Barbara Boxer (D-Calif.), who's the new darling of the MoveOn far left as Clinton edges to the center on issues like abortion — and is now being touted in some quarters as a dark horse 2008 contender. Consider: Clinton voted yes on the Iraq war, Boxer voted no and went to Iraq a few weeks ago and...