From January 1st, 2008, David Limbaugh makes his case against the other GOP candidates and for Fred Thompson. He says "It's time to step up, Fred."
(David nails my concerns with Huckabee, Rudy and McCain. He's mildly supportive of Romney, but finds Thompsons's lack of "fire in the belly" refreshing. I think Thompson (with a few exceptions) doesn't pander; not feeling obligated to say what we want him to say--but I wish he'd get enthusiastic and prove "HE" thinks he can win.) 
