Drop out or drop dead - This guy looks like a walking corpse at the debates. Where's an NBC makeup artist when Fred needs one? Hard to vote for a guy who doesn't look like he'll make it to the inaguration!
And there are those who would say that your candidate, Ron Paul, has an almost constant facial expression which seems to convey "clueless". Hard to vote for a guy who doesn't look like he is smart enough to find the inauguration.
I guess what we see is strongly influenced by our stated preference, huh?