I took a quick look at the most recent poll (Fox News).
It lists unfavorable numbers for candidates:
Mitt Romney 36%
Hillary Clinton 49%
Fred Thompson and Mitt Romney have identical favorable numbers. Fred has smaller unfavorable (32% vs 36%) number, but he has higher “never heard” number than Mitt (12% vs 16%).
This looks more credible and in line with other polls.
Whatever makes you feel good about the liar from Massachusetts...no, not John Kerry, Willard Myth Romney.