Diversionary tactic. They would rather have her in the Senate than poised for a WH run in 2016.
One can run for President and still be in the Senate. In the Senate she will have an official presence in Washington DC. From there she can work to change things and speak out against Obama and Harry Reed and all-—It would be the best place to use her talents. BUT it would not be easy—the left will do all they can to defeat her—but she is a fighter. No, the left do not want her anywhere near Washington DC.