Sentence:  [N]ot only does Kerry have a <WSD>flannel-mouthed</WSD> inability to utter a simple sentence, but his orotundities also serve to reinforce the notion that the Senator from Massachusetts is a patrician stiff, too smug to speak in a manner decipherable by ordinary Americans. 
Meaning of the word marked with <WSD> tags:  Unclear, muffled, or halting in speech.