deadly string of assassinations. and the first lady of the united states reacting to a controversial new book about the obama white house, saying she s not the stereotype of, quote, some angry black woman. i m wolf blitzer, you re in the situation room. with back-to-back wins in iowa and new hampshire, mitt romney has now done what no other republican incumbent candidate has ever done, once again no republican candidate except, i should say, for a sitting president. romney, of course, wants to be sitting in the white house next year, but that road leads through south carolina. that s the next primary state in ten days. his opponents are digging trenches and putting up barricades there in an all-out effort to halt his momentum. south carolina has a representation for rough and tumble primary and for picking winners. jim accost ha has the latest. jim? reporter: if only the south carolina primary could be tomorrow for mitt romney, it s going to be potentially a brutal te