Democrats are trying to nip in the bud the notion that their majorities are vulnerable.  Charlie Cook has written about their arguments twice this week, and Greg Sargent has an article up at the Washington Post.  The gist of the argument is as follows: -- Four Republican seats -- DE-AL (open), LA-02 (Cao), HI-01 (Djou) and IL-10 (Open) are in the bag, raising the number of seats that... (Read Full Article)