WASHINGTON -- Jim DeMint, among the nation's conservative leaders, stopped just short Thursday of endorsing Mitt Romney for president as the South Carolina senator called on the former Massachusetts governor's foes to re-evaluate their campaigns. DeMint's appeal for Republicans to focus on defeating President Barack Obama came a day after former Florida Gov. Jeb Bush, another influential conservative, endorsed Romney and urged party unity. "What I can tell conservatives from my perspective is that I'm not only comfortable with Romney, I'm excited about the possibility of him possibly becoming our nominee," DeMint told reporters on Capitol Hill. At a time...