Sudden mouth covering accompanied by elevated eyebrows, elevated forehead and increased scleral-show (eyes lids opened in a "White and Wide" appearance) indicate surprise-disbelief and empathy. There often is an element of fear accompanying this facial-appearance-hand-gesture as well, although in this particular example of Presidential Candidate hopeful and current Texas Governor Rick Perry - we would need to see either a brief video of this and adjacent moments, or images immediately before and after to definitively identify the emotion of fear.
See also: Relationship Secret # 21: Surprise + Fear + Empathy
See also: Leadership Secret # 221: Hillary's Empathy
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