Quite a snippet here from Power Line:

The Fred Thompson campaign recently set up an event for 60 of Congress's most solid conservatives. Many of them were hoping to be able to endorse Thompson. Unfortunately, Thompson did not impress the Congressmen. He did not appear to be ready for a tough Presidential campaign. One of his aides explained that Thompson was "rusty," which, as one Congressman told me, did not inspire much confidence in this YouTube era. Some of those who attended are now looking at Mitt Romney as the most viable conservative in the race.

Thanks to reader Lee for the tip.