U.S. Senator Hillary Clinton has used her commanding victory in Sunday's presidential primary in Puerto Rico as the basis for an appeal to Democratic Party officials that she would make a better candidate than her rival, Senator Barack Obama.
With 98 percent of the polling places counted, Clinton defeated Obama by a margin of 68 percent to 32 percent.
But in spite of Clinton's victory, frontrunner Obama drew even closer to claiming the party's nomination.
Obama's campaign said Sunday on U.S. television it expects him to have the nomination in hand before the end of the week.
After the two remaining state primaries in South Dakota and Montana Tuesday, Obama is expected to be within a few dozen delegates of winning the nomination, making it appear likely that the party's so-called superdelegates will decide the winner.
Speaking to supporters Sunday in San Juan, Clinton appealed to the superdelegates -- asking them bluntly which candidate best represents the will of of the people who voted in the primary.
There remain some 200 superdelegates who have not disclosed their choice. The superdelegates are party officials and office holders whose votes are not apportioned in relation to popular votes or caucus results. They are free to vote for the person they think will be the strongest candidate.