Hillary Rodham Clinton has won a largely symbolic victory in Puerto Rico's presidential primary, the final act in a weekend of tumult that brought Barack Obama tantalizingly close to the Democratic presidential nomination. The former first lady was winning a convincing victory in early returns on Sunday, and a pre-election poll suggested she could wind up with nearly two-thirds support. But in defeat, Obama was on track to gain at least 14 delegates, bringing him within 50 of the 2,118 needed for the nomination. Aides to the 46-year-old Illinois senator said he would clinch the long-sought prize within days. "We hope this week, absolutely," said spokesman Robert Gibbs. Montana and South Dakota hold primaries on Tuesday, the last of the primary campaign season.