John Kerry can already wow an audience with ‘Ring of Fire.’ Now a group of industry leaders is trying to convince Southern country music fans to support the senator in November. How does John Kerry plan to capture the hearts and minds of the so-called Nascar Democrats, those relatively conservative, rural Southern whites who tend to vote Republican? There's choosing an appealing running mate, of course. But there are some party insiders who think a liberal Yankee could take another route: country music. The Music Row Democrats (MRD) aim to do just that. Founded earlier this year in Nashville by...