I've noticed that too
#225, some people from the South particularly parts of Georgia (like Phil Gramm originally from Ga), and parts of SC,TN, and other Southern States twist their mouths when they talk. I have never been able to figure out why, and I have lived in the South since 1966, and the Deep South since 1968. It is not all Southerners and sometimes it is a regional "thang", but Edwards has it, and it may be because he was born and raised in SC, then moved to NC. Someone more knowledgeable about dialects, and accents would better figure it out. At least he does not say "hit was not", or "High 95" (I-95) like some of my TN, and Va friends say. Sort of like the Bronx and Brooklyn mouth twisting accents. For a Politician running in 50 States, it is not helpful.