Jennifer Rubin: Hillary has been a disappointment as secretary of state.

Rubin offers this speculation:

Had she stayed in the Senate, she might have inherited the mantle of liberal leadership from Ted Kennedy. Clinton might have been the one to pull a rabbit out of the hat to save health-care reform. But once again her ambition got the best of her and her self-image of super-smart, super-capable policy wonk led her to a poor career choice. Now, politics is filled with second and third acts, and maybe her political career will recover. But I’m not sure her reputation ever will.