Hillary Clinton won the Democratic presidential primary in Puerto Rico on Sunday, and is expected to return to the mainland with a purseful of delegates.

Puerto Rico’s role was enhanced in the Democratic primary election process this year as its 55 delegates are a critical chunk in the remaining three contests in a marathon primary season that has yet to crown a nominee.

Returns were expected to come in slowly but some pre-vote estimations had Clinton winning about 35 of the total delegates to Obama’s possible 20.

Obama’s aides are confident, however, they are only a stone’s throw from the nomination. With 2,052 delegates heading into the day, Obama needs just 66 to get to the magic number of 2,118 delegates needed to claim the nomination. Clinton had 1,877 delegates going into the Puerto Rico contest.

The largely symbolic vote comes with only two contests left on the calendar — Montana and South Dakota, which both vote Tuesday.

(YWN Desk / Fox News)