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good morning to you. i m carol costello. thank you for joining us this morning. mitt romney is standing by his decision to attend a vegas fund-raiser with donald trump today even though the real estate mogul won t let go of the birther issue. trump is again questioning where president obama was born. he first raised the issue a year ago. you know, back when he was running for president. barack obama should end this. he should provide the public with a birth certificate. if he doesn t do it, he s doing a tremendous disservice to the public. trump harped on the issue for such a long time that for the first time in american history, an american president produced his long form birth certificate. trump still hasn t put the issue to arrest but romney welcomes his support. joining me now is cnn senior political analyst ron brownstein. hi, ron. good morning. the obama campaign is hitting back with a new campaign ad going after romney about this controversy. let s watch ....