And the moment you all knew would come eventually:

Fred Dalton Thompson is planning to enter the presidential race over the Fourth of July holiday, announcing that week that he has already raised several million dollars and is being backed by insiders from the past three Republican administrations, Thompson advisers told The Politico.
...
Thompson's formal announcement is planned for Nashville. Organizers say the red pickup truck that was a hallmark of Thompson's first Senate race will begin showing up in Iowa and New Hampshire as an emblem of what they consider his folksy, populist appeal.

I wonder who he'll eventually choose as his running mate?  Maybe Tommy?