Find CDs with a low early withdrawal penalty (Ally bank for example) and you've for many intents and purposes eliminated inflation risk, to which the bonds are vulnerable. Inflation may not go up, but it certainly can't go much farther down. See for example http://www.cbsnews.com/8301-505123_162-37741854/four-cds-tha....
tangent: I never saw the point in CDs if I could get a better rate on treasury or muni bonds