In this interview published on 23 October 2015 with Major Garrett, Jeb Bush among other issues says (beginning at 0:31), "... People in Florida know that I have a proven record of conservative reform. I gotta go share that - and we're startin' to do it in the early states and it's, it's, we're making progress ..."
It's widely known that blinking rate increases with anxiety levels. While this is certainly true, it's always important to compare the blinking frequency changes throughout a conversation. This contextualizes the change in a nonverbal sign (here, the blinking rate) with the verbal content - as well as the paralanguage.
Note that at 0:36, Gov. Bush changes his head from tilted-right to a tilt-left along with a higher pitch of his voice. In addition, his forehead muscles also elevate (contract) along the entire width. During the 0:38 - 0:39 segment, as the republican candidate says, "... it's, we're making progress ...", Gov. Bush then displays a series of rapid blinks.
This cluster of rapid blinking coupled with his forehead contraction and rapid change of head tilt (nonverbal) with his stuttering and re-formulating his response ("... it's, it's, we're ...") (verbal) and elevated pitch (paralanguage) indicate that Jeb Bush does NOT BELIEVE that his campaign is making progress. Thus while Mr. Bush may indeed believe that early polling numbers truly don't matter very much (and many experts would agree) - he still has considerable anxiety that his campaign is not making the progress it should be. Jeb is worried.
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