hoping to take on the candidate who may pose the greatest challenge to president obama. we are talking about mitt romney. herman cain is live with us here in the situation room this hour. we will talk about what is behind declined in the recent polls. criticism of his 9-9-9 tax plan and much more. i m wolf blitzer, you re in the situation room. he s the only candidate whose been consistently at the top of the polls in the volatile republican race for the white house. that has mitt romney increasingly targeted by president obama s supporters. now in an unusual move, the democratic national committee is targeting romney in an effort to sway the gop nominated contest pmt cnn s joe john says working the scene for us. joe, what is going on here. it raises the question, whose primary is this anyway. it was much easier to keep track of this when it was just republicans fighting among themselves. the latest in the republican battle comes from the democratic national committee,