Should Santorum and Paul quit the GOP race?

Mitt Romney’s cruise to the GOP nomination is not so certain after the crippling blow he took in the South Carolina primary. It’s clear that Newt Gingrich’s win extends the Republican race into Florida and quite possibly into the spring if not longer. The primary results also dashed the hopes of former Senator Rick Santorum and Congressman Ron Paul since they finished far behind. Romney still has the largest and best-funded organization but Gingrich is catching up. His come-from-behind victory in South Carolina will give him a big boost. Along with increasing support among voters,...