GOP fight now Romney vs. Santorum; Gingrich lags

GOP fight now Romney vs. Santorum; Gingrich lags

SAN JUAN, Puerto Rico (AP) — The Republican presidential contest rumbled into Puerto Rico today as a two-man race, with Rick Santorum nipping more aggressively at Mitt Romney’s heels after again frustrating the front-runner in Southern primaries. Former House Speaker Newt Gingrich, with little to show for pinning his hopes on the South, nonetheless vowed to stay in. His deputy campaign manager outlined a strategy aimed at denying Romney a clean win before the Republican convention in August and making Gingrich’s case to delegates along the way.