Crist's popularity as governor doesn't always extend to members of his own Republican Party, and that might make him vulnerable as he runs for U.S. Senate. BY ADAM C. SMITH Charlie Crist is swimming in campaign money, and polls consistently show him to be among the most popular politicians in America. But something ominous and unpredictable is brewing in Florida, and a growing number of Republicans are starting to consider the unthinkable: the people's governor could lose his campaign for U.S. Senate. "It's rare that I talk to anyone that's got a good thing to say about the governor right...