Romney wins Puerto Rico Republican primary
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Mitt Romney won an overwhelming victory over chief rival Rick Santorum in Puerto Rico's Republican presidential primary, but Romney was campaigning in the critical heartland state of Illinois ahead of that state's primary on Tuesday - another chance to prove he's the best choice to challenge President Barack Obama in the November election.
The former Massachusetts governor has been unable to win the hearts of the party's conservative base who distrust Romney for his moderate past positions on important social issues like abortion and gay rights. (AP)
