Are those polls sponsored by the GOP? Remember that, try as they might, a caucus can't cast your vote for you. But I understand that they have a lot of political sway. The caucus would love for the voters to believe that they can only vote for the chosen candidate.
If it makes you feel any better, (in Connecticut) Lieberman was losing to Lamont in the polls, lost the primary and was told to either drop out of the race or leave the Democrat party. We know how that turned out.
I don't have much faith in polls, either.
I'm not a Ron Paul supporter, but like you, I noticed the absence of his name in recent polls.