SAN JUAN, Puerto Rico  - Mitt Romney has scored a resounding win in Puerto Rico’s Republican primary, gaining momentum in a usually overlooked race with newfound significance in the hotly contested White House race. With the final tally in late Sunday, the former Massachusetts governor won more than 83.4 percent of the vote, according to the the State Elections Commission, or CEEPR, in the US territory. His chief rival Rick Santorum stood a distant second with 7.7 percent. Former House speaker Newt Gingrich had two percent, just ahead of Representative Ron Paul’s 1.1 percent.