SAN JUAN, Puerto Rico — Mitt Romney scored an overwhelming win Sunday in Puerto Rico’s Republican presidential primary, trouncing chief rival Rick Santorum on the Caribbean island even as the two rivals looked ahead to more competitive contests this week in Illinois and Louisiana.

The victory in the U.S. territory was so convincing that Romney, the GOP front-runner, won all 20 delegates to the national convention at stake because he got more than 50 percent of the vote. That padded his comfortable lead over Santorum in the race to amass 1,144 delegates to clinch the nomination.

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