Fred Thompson seems to be throwing himself under the bus. From ABC in Iowa:

By declaring that he needs to do better than he’s polled for months, Thompson risks setting a bar so high for himself that a third-place victory — which would be something of an achievement for his struggling campaign — is a self-imposed disappointment. Under his own rules, Thompson could beat Sen. John McCain, R-Ariz., and former New York Mayor Rudy Giuliani in the caucuses and still be setting himself up to drop out of the race.