back to libya in just a few moments. lisa sylvester is monitoring some other top stories in the headlines on the political ticker. >> the potential republican 2012 field has shrunk by one. senator john thune of south dakota announced today he'll not seek the 2012 gop nomination. thune has been labeled a rising republican star and his white house aspirations have been the subject of speculation for months and he announced in a joint statement on facebook. richard mordack was challenged to richard lugar calling him barack obama's favorite report. he has support of over three-fourth's of the state's leadership.